The half-life of Uranium-235 is 700 million years. The correct answer is option D.
What is half-life?
Half-life is the time period taken by the radioactive atoms to decay and to decrease to half of the original number of radioactive atoms that were present initially. The half-life of a radioactive element tells about the rate at which it decays and releases radiation
Uranium has thirty-seven different isotopes. Uranium-235 is an isotope of uranium. This isotope is important because it releases a large amount of energy on splitting. It is not highly radioactive as it releases less radiation.
Here, it is given that the Uranium sample initially contains 200 atoms which decrease to 100 atoms after 700 million years which is half of the initial number of atoms in that sample. so the half-life of the Uranium-235 sample is 700 million years.
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1. A rhythm of activity that runs at a frequency that is independent of external cues is called a _______ rhythm.
phase shift
circadian
nocturnal
free-running
Answer:
Circadian rhythm
Explanation:
Circadian rhythm is a natural, internal process that regulates the sleep-wake cycle. It repeats that cycle on each rotation of the Earth every 24 hours. It has been said that if your circadian rhythm is out of weight can cause weight gains, impulsivity, slower thinking, and other behavioral changes it is similar to those who experience jet lags and work shifts.
Hope this helped :)
Roughly how many different species (of plants, animals, bacteria,
etc.) do you think scientists have identified?
SELECT AN ANSWER
10 million
500,000
two million
10,000
SUBMIT
Answer:
about 2 million species have been Identified, but more are still undiscovered under the mariana trench.
Please help this is part of work that’s due in two days and I would really appreciate it if you could help me.(and by the way it’s 25 points)
Answer: Ask your teacher for some help
Explanation: if anything can help us your teacher
Water is a blank
which means it has an unequal distribution of charges.
a. Hydrogen bond
C. chemical reactions
b. Polar molecule
d. element
A dead body is in "full rigor" Approximately how many hours has this person been dead?
"How does a multicellular organism grow larger?
А
The organism absorbs new cells from other organisms.
B
Individual cells in the organism grow larger as they age.
с
Cells in the organism divide, increasing the total number of cells.
A multicellular organism grows larger, and cells in the organism divide, increasing the total number of cells. The correct option is с.
What is a multicellular organism?Multicellular organisms (plants, animals, and fungi) are life forms that have two or more cells. Cells in multicellular organisms are specialized to accomplish specific tasks.
Red blood cells, for example, are designed in humans to transport oxygen and nutrients to all bodily cells. Furthermore, multicellular animals' somatic cells divide by mitosis, whereas germinal gametic cells divide via meiosis.
The cell divides itself and forms identical cells, then these cells divide again and again. It is called cell division.
Therefore, the correct option is с. Cells in the organism divide, increasing the total number of cells.
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As a multicellular organism expands, its cells divide, increasing the total number of cells in the body, hence option C is correct.
Individual cells inside multicellular creatures expand and divide through a process known as mitosis, which enables the organism to flourish.
Every multicellular creature begins as a single cell called a zygote. The zygote, which is created by the fusion of the male and female gametes, divides further to become the multicellular creature. The cells develop into a multicellular, fully functional system.
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9. A therapist who believes that depression is caused by the way people THINK
about things would support which of the following perspectives?
a. Behavioral
b. Cognitive
C. Psychoanalytical
D. Humanistic
According to the research, a therapist who believes that depression is caused by the way people think would support the cognitive perspective.
What is the cognitive perspective?It focuses on the study of mental processes such as perception, planning or the extraction of inferences, that is, in the thought processes and in the behavior that manifests those processes.
From this perspective, the patient with depression presents a scheme that involves a negative thought of himself, the environment and the future.
Therefore, we can conclude that according to the research, a therapist who believes that depression is caused by the way people think would support the cognitive perspective.
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This structure gives a cell shape, allows it to move, and moves organelles. 5 points a) cytosol b) cytoskeleton c) cytoplasm d) plasma membrane
Answer:
B) cytoskeleton
Explanation:
the cytoskeleton is a network of connected filaments and tubules.
Which type of plant lives the longest?
Answer:
Great Basin Bristlecone or Pinus longaeva for it's binomial name. Which is known as the Methuselah.
CAN SOMEONE PLEASE HELP ME WITH THIS SCIENCE QUESTION I WILL MARK YOU BRAINLIEST THANK YOU
Answer:
agroforestry
Explanation:
Answer:
industrial agriculture
A type of insoluble carbohydrate, often stored in leaves and other parts of the plant?
Answer:
Starch
Explanation:
The answer is starch, it is an insoluble carbohydrate and can be stored in plants
Are protons positive negative or neutral charged
Answer:
positive charge
Explanation:
Which hypothesis proposes the correct explanation for the variety of traits in a species?
A. Cloning creates variety because offspring receive genetic material that is different from that of their parent.
B. Budding creates variety because offspring receive genetic material that is different from that of their parent.
C. Sexual reproduction creates variety because offspring have a different combination of genetic material than either parent.
D. Fragmentation and regeneration create variety because offspring receive genetic material that is different from that of their parent.
Answer:
A. Cloning creates variety because offspring receive genetic material that is different from that of their parent.
Explanation:
A controlled experiment _____. Group of answer choices Includes at least two groups, one of which does not receive the experimental treatment Is repeated many times to ensure that the results are accurate Proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data Includes at least two groups, one differing from the other by two or more variables
Answer:
A. Includes at least two groups, one of which does not receive the experimental treatment
Explanation:
A control experiment can be defined as an experiment in which a condition assumed to be a probable cause of the effect is being compared to the same situation by the scientist without involving or using the suspected condition.
Also, an experimental group can be defined as a collection of participants that are subjected to the independent variable.
Generally, most scientific experiments usually have a control group so as to avail the scientists (experimentalists) an ability to compare the outcome of their test results. This control group is not given the treatment or influenced by the same independent variable as the experimental group.
Therefore, this is the reason why science completely or totally rejects any hypothesis which is not supported by observations, as well as the results obtained from control experiments.
This ultimately implies that, for any hypothesis to be acceptable in science, it must be supported by observations and the results of control experiments; this give rise to factual informations, theories and by extension solutions to problems.
Hence, a controlled experiment includes at least two groups, one of which does not receive the experimental treatment.
A controlled experiment includes a control group and at least one experimental group. Option A). A controlled experiment includes at least two groups, one of which does not receive the experimental treatment.
In a controlled experiment, the researcher wants to identify the effect of one or more variables on something.
Since many different variables might be affecting the results, and most of them are not of interest to the researcher, they must be kept under control. They must remain constant.
There must be at least two groups. One of them must be the control group, and the other one (or other ones) is the experimental group.
During an experiment, the researcher compares the two groups. Both of them are composed of individuals coming from the same population, so they are identical in all aspects except for the independent variables that the researcher changes in the experimental group to observe how they affect the individuals.
The control group is used to identify any other factors influencing the results obtained in the study, apart from the modified variables of the treatment. The independent variable keeps constant in the control group. The experimental group receives the treatment. The researcher voluntarily changes the values of the independent variable to observe how it affects the individuals subjected. There can be several experimental groups.
Hence, A controlled experiment includes at least two groups, one of which does not receive the experimental treatment.
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What controls the nervous system?
the diagram below represents the time a cell spends in the two main phases of the cell cycle. in which phase does a cell spend more time?
Answer:
A. Interphase
Explanation:
I majored in Biology
HELP ITS DUE SOOOONNNN
Answer:
true is the correct answer
Answer:
true is the correct answer
Explanation:
I don't know
what is amino acid??
Where within the cell does translation occur?
Translation is the second phase of protein synthesis. This process occurs in the cytoplasm in an organelle called the ribosome. Where the strand of RNA is deciphered to synthesize peptides.
Jenna took an open bowl of leftover mashed potatoes from the refrigerator and noticed a difference in smell. She determined that chemical changes occurred since the potatoes were first placed there. Which observations most likely led to Jenna’s conclusion?
Answer:
a production of odor
Explanation:
Odors are caused by a chemical change in the food which people can smell, this observation led to her conclusion
Answer:
A change in Oder
Explanation:
A particular protein has the amino acid sequence: . . . Ala-Pro-His-Trp-Arg-Lys-Gly-Val-Thr . . within its primary structure. A geneticist studying mutations affecting this protein discovered a mutant that produced a shortened protein molecule that terminated within this region. In this mutant protein, the His became the last amino acid. What DNA single-base change(s) would cause the protein to terminate at the His residue
Answer:
The correct answer is - nonsense mutation.
Explanation:
The given amino acid sequence Ala-Pro-His-Trp-Arg-Lys-Gly-Val-Thr of a particular protein is affected by a mutation that leads to the shortened protein that ends in this region only. As we know the His amino acid becomes the last amino acid so in such case is it takes place due to nonsense mutation that is the only mutation or change result to terminate before or at the His codon.
The Trp codon which is coded by UGG codon could have been changed to either a UAG or a UGA codon in this case.
The correct answer is - nonsense mutation.
hello i did not mean to post question
4. Do you think that increasing the number and kinds of observations you make about something would affect any inferences you make about those observations? Why or why not?
Answer: The number of observations (sample size) is important in determining the reliability of statistical inferences. The kind of observations depends on what hypothesis is being tested. Different statistical techniques are required depending on whether the data is categorical or discrete or continuous and whether observations are quantitative or qualitative. Increasing the kinds of observations (multiple sets of data) may also add to the reliability of the test of the hypothesis.
Explanation:
In general, a larger sample size improves the reliability of any statistical inference, particularly when there is more variability (higher variance) in the data and when the expected effect is small. A larger sample reduces the chance of random error.
Where more than one variable is associated with output data, it is of course necessary to collect data of different kinds. For example, if your hypothesis is:
H: y = ax1 + bx2 + cx3 + ...........
then you need to have observations of x1, x2, x3.........
fdtygfgyhgfcgtyghvfghgfyhgnExplanation:
Cystic Fibrosis is a homzygous recessive disease that affects 1 in 3400 people. What percent of the population are carriers?
Answer:
The correct answer is = 0.02 or 2.5 percent approx.
Explanation:
Given:
CF is a recessive disease that affects 1 in 3400 people
The frequency of the recessive allele in the population (q2) -
= 1/3400
= 0.0002. Therefore, q is the square root, or 0.014.
The frequency of the dominant allele in the population (p)
= 1 - 0.014 = 0.986 (or 98.6%).
The percentage of s carriers in the population.
2pq equals the frequency of heterozygotes or carriers, then the equation will be as follows:
2pq = (2)(.986)(.014) = 0.02 or 2.5 percent approx.
Essay Writer- Please write a response to the question below.
Your brain has many functions beyond monitoring the environment and controlling your muscles. For example, your brain can also store memories. How do you think this function can
help keep you safe from harm?
Answer:
In our memories is our experience present.
Explanation:
Stored memories is a function of brain that can help in keeping you safe from harm because in our memories we experience what is harmful and better for us. So due to these memories we remain far from harmful materials such as fire, electric wires etc so we can say that these memories plays a vital role in keeping us save from harm.
I only need help with problem number 2.
Answer:
Scanning
Explanation:
please help! :)
Identify the most efficient way to protect biodiversity.
Explain your reasoning.
**please do not put the sample response :) **
Protecting habitats before they are torn down.
or
we can consume less and be more mindful about what we consume.
The efficient way to protect biodiversity is to protect plant and animal species that are extinct day by day and minimize the effect of pollution on the environment.
What is biodiversity?Biodiversity is the diverse living things and nonliving things present on the earth. Biodiversity refers to the different species of plants and animals that live and interact with each other, and they are also dependent on each other.
Nature is interdependent, every organism depends on another organism for its living and the dance of the autotrophs gives energy to animals.
It is important to protect biodiversity because if animals and plants while extinct other animals can as also be living.
Thus, the most effective strategy to preserve biodiversity is to safeguard the rapidly disappearing plant and animal species while reducing environmental degradation.
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Question 1 of 10 A scientist is responsible for monitoring water quality in a river that flows by a large city. She monitors the levels of many substances. This helps her determine the city's impact on the river water. Which substance does she not need to monitor? O A. Phosphates B. Nitrates C. Bacteria D. Carbon
Answer:
D
Explanation:
Answer:
D. Carbon
Explanation:
Took the Test on A P E X
2: Which numbers should be inserted for A and B in the chart?
A: A = 1 and B = 2
B: A = 1 and B = 4
C: A = 2 and B = 2
D: A = 2 and B = 4
Answer:
b
Explanation:
Please help me guys!!
the carbon cycle, photosynthesis, and cellular respiration and show how they are connected/work together in an ecosystem. Play the role of a carbon atom in an ecosystem. Start with the production, how are you made? And then explain how you transform through different processes. Make sure to include your role in the carbon cycle, photosynthesis, and cellular respiration. There is no set length, as long as you explain the role of carbon in each process.
Answer:
Cellular respiration and photosynthesis are important parts of the carbon cycle. The carbon cycle is the pathways through which carbon is recycled in the biosphere. While cellular respiration releases carbon dioxide into the environment, photosynthesis pulls carbon dioxide out of the atmosphere.
Explanation:
Cellular respiration and photosynthesis are important parts of the carbon cycle. The carbon cycle is the pathways through which carbon is recycled in the biosphere.
What do you mean by cellular respiration?Cellular respiration is the process by which biological fuels are oxidised in the presence of an inorganic electron acceptor such as oxygen to produce large amounts of energy, to drive the bulk production of ATP.
Cellular respiration is a series of chemical reactions that break down glucose to produce ATP, which may be used as energy to power many reactions throughout the body.
Cellular respiration is the process that occurs in the mitochondria of organisms (animals and plants) to break down sugar in the presence of oxygen to release energy in the form of ATP.
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