Answer:
The three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart.
Explanation:
In Anatomy, cardiac cycle can be defined as a complete heartbeat of the human heart which comprises of sequential alternating contraction and relaxation of the atria and ventricles, therefore causing blood to flow unidirectionally (one direction) throughout the human body.
Generally, the cardiac cycle occurs in two (2) stages;
I. Diastole : in this stage, the ventricles is relaxed and would be filled with blood.
II. Systole: at this stage, the muscles contracts and thus, allow blood to be pushed through the atria.
All amphibians and reptiles except for crocodiles (having four-chambered heart) have three-chambered hearts, which typically comprises of a partially divided ventricle and two atria.
Hence, the correct statement about the three-chambered hearts of amphibians and nonbird reptiles is that, the three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart due to the partially divided ventricle.
How do environmental factors help determine which members of a species will survive or become extinct?
Answer:
Natural selection
Explanation:
Whether or not an organism survives to reproduce depends on their surrounding environment. This is natural selection. Over time, that mutation can develop into a distinguishable adaptation and/or become more pronounced in a species since it increases the chances of survival.
Hope this helps:)
The overriding problem with both theories of muscle growth, hypertrophy and hyperplasia, is that __________. A. neither can be accepted as correct because muscles growth is difficult to study in humans B. neither one is theoretically possible C. neither has been studied by reputable scientists D. neither has been accepted by member of the fitness community Please select the best answer from the choices provided.
Answer: A. neither can be accepted as correct because muscles growth is difficult to study in humans.
Explanation:
Hypertrophy can be defined as the increase in the fiber size of the muscle whereas the hyperplasia can be defined as the increase in the number of muscle fibers. Additionally the hypertrophy suggests that adding more proteins to the fibers is suggestive of the growth of the muscles. But these two theories cannot be directly related to the muscle growth in humans as the development and growth of muscles are dependent upon several factors like diet, any kind of disease which restrict the muscle growth and movement, physical activities, mineral availability responsible for growth, malnutrition, and others.
Answer:
A
Explanation:
Explain the difference between DNA, chromosomes, genes, and the protein that is created.
I NEED THIS QUICKLY PLS!!!
Explanation:
DNA is a long molecule that contains our unique genetic code.DNA is composed of two strands that wrap around each other to form a double helix shape.
Genes are sections of DNA that contain the set of instructions to produce one specific molecule in your body, usually a protein. These proteins control how our body grows and works; they are also responsible for many of our characteristics, such as our eye colour, blood type or height.
Chromosomes are bundles of tightly coiled DNA located within the nucleus of almost every cell in our body. Humans have 46 chromosomes . We inherit one set of 23 chromosomes from our mother and one set of 23 chromosomes from our father. So we have two sets of 23 chromosomes or 23 pairs.
Please select the word from the list that best fits the definition
Answer:
Tiltmeter would be the best answer.
B: What are THREE (3) things your friend could do to reduce his/her risk of developing one of these diseases?
Example: You should eat food that have healthy fat such as avocados so you can still have a source of energy but without risking your health.
URGENT HELPP!!!!
Answer:
Exercise regularly, eat a healthy diet and avoid stress.
Explanation:
Exercise regularly, eat a healthy diet and avoid stress are the things that can reduce the risk of developing these diseases because these three things make our body strong and healthy which can fight against these diseases. Regular exercise makes our body strong as well as prevent us to become fatigue. Eat healthy and optimum amount of food fulfill all our needs of body and our body work more efficiently. Stress has a very adverse effect on our health so by avoiding it, we can save ourselves from many diseases.
 HELP. HELP.
True or False: If two organisms are located near one another on a phylogenetic tree they share a recent common ancestor.
Division creates 2 types of B Cells: _________________ and Memory B Cells
Lymphocyte is the anwer
Answer:
Hello There!!
Explanation:
The answer is plasma cells.
hope this helps, have a great day!!
~Pinky~
is plasma the liquid portion of blood?
Answer:
Plasma is the liquid portion of blood. About 55% of our blood is plasma, and the remaining 45% are red blood cells, white blood cells and platelets that are suspended in the plasma.
Explanation:
Answer: Plasma is the liquid portion of blood.
Explanation: About 55% of out blood is plasma, and the remaining 45% are red blood cells, white blood cells and platelets that are suspended in the plasma.
Help please <3 Thank you
Answer:
The answer is C
:::::::::::::::::::
What are exons and introns and how are they dealt with in the cell?
Answer:
Exons are coding sections of an RNA transcript, or the DNA encoding it, that are translated into protein. Exons can be separated by intervening sections of DNA that do not code for proteins, known as introns.
Explanation:
Which of these is not a human cause of extinction of species?
Choose the correct answer.
A) Clearing of an area for farmland.
B) A dam built in a river for city water usage.
C) Competition for food resources with another native species.
D) The introduction of a new predatory species to an island by boat.
The statement that does not represent a human cause of the extinction of species is the competition for food resources with another native species. Thus, the correct option for this question is C.
What is species?Species may be characterized as a group or collection of organisms that can significantly reproduce with one another in nature in order to produce fertile offspring. The process of speciation is generally mediated through the species.
In the present time, the human causes of the extinction of species are majorly popular. It includes the clearance of an area for farmland and industrialization, the building of a dam for city water utilization, the introduction of a new predatory species to an island by boat, and many more.
But the process of competition for food resources with another native species is ultimately the behavior governed by the respective species itself without the interference of humans.
Therefore, the statement that does not represent a human cause of the extinction of species is the competition for food resources with another native species. Thus, the correct option for this question is C.
To learn more about Species extinction, refer to the link:
https://brainly.com/question/1027555
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In 2-3 sentences, explain how crossing over and independent assortment in sex cells affect the appearance of the fully developed organism.
Answer:
Explanation:
Crossing over and independent assortment in gametes (sex cells) can lead to genetic variation in the DNA of these gametes and lead to offspring looking different from their parents. Crossing over is the exchange of DNA between a pair of homologous chromsomes (the mom and the dad) which results in recombinant chromsomes that have new combinations of genes. Independent assortment refers to the lining up of chromsoomes along the metaphase plate in meiosis 1, and this can lead to different combinations of gametes.
Fill in the blank
DNA IS NOT “TURNED ON” ALL OF THE _____ IN ALL OF THE CELLS.
Answer:
time? maybe I'm not to sure but I wanted to help
GIVING BRAINLIEST!!!!
Name the types of adaptation that animals and plants can have
Answer:
poison, thorns, sharp teeth
Explanation:
Based on the above graphic.
What percentage of the offspring
will be
Red:
White:
Pink:
Answer:
what is the name of this website
or the book?
List 2 organisms that are NOT plants that have the ability to do photosynthesis.
Answer:
- The Green Sea Slug
- Pea Aphids
Which choice is involved in both sexual and asexual reproduction
Cardiac output is the amount of blood pumped by the heart in one minute. Which of these will increase cardiac output?
Answer: the factors that increase cardiac output include:
--> Nervous stimulation and
--> Hypertrophy of the heart.
Explanation:
Cardiac output can be defined as the quantity of blood pumped into the aorta each minute by the heart. This is also the quantity of blood that flows through the circulation. There are factors that can cause increased cardiac output or that can lead to a hypereffective heart. They are:
--> NERVOUS STIMULATION: The combination of sympathetic stimulation and parasympathetic inhibition does two things to increase the pumping effectiveness or cardiac output of the heart. These include:
• it greatly increase the heart rate from the normal level of 72 beats/mum up to 180 to 200 beats /mom.
• it increases the strength of heart contraction, which is called increased contractility to twice it's normal strength.
--> HYPERTROPHY OF THE HEART: A long term increased workload, but not so much excess load that it damages the heart, causes the heart muscle to increase in mass and contractile strength in the same way that heavy exercise causes skeletal muscles to hypertrophy. This effect of increased muscle mass of the heart, allows the heart to pump much greater than usual amounts of cardiac output.
A researcher using random assignment:
a
puts half the group in the dependent variable group and half in the independent variable group in a random way.
b
places participants in the sample group or the population group randomly.
c
assigns participants to the experimental and control groups by chance.
d
gives half the sample the dependent variable and doesn't give anything to the other half.
AAnswer:A
Explanation:because why not
need answers asap if you want points tell me in the COMMENTS and I'll be happy to make something just for u!! Just do not answer if you don't know or if you just want points. Thanks I love you your a lifesaver!! Pls tell me 6-9, the others I have already
Choose the best answer.
Crossing over is important because it creates
A)gene splicing
B)new breed
C)genetic diversity
D)zygote
E)double helix
1. Which structures make up the stamen and what gamete does it make?
2. Which structures make up the pistil and what gamete does it make? :
3. What is the primary function of a flower?
I
4. In which structure(s) does meiosis occur? :
5. Where does fertilization occur?:
6. In which part of the male reproductive organ are the pollen grains made?:
7. In which part of the female reproductive organ are the egg cells made?
1. The anthers and filaments make up the stamen and the stamen is responsible for making the male gamete. 2. The pistil is divided into three parts namely stigma, ovary, and style. It produces the female gamete. 3. Flower produces male and female gametes. 4. The anther and ovary. 5. Ovary. 6. Anthers. 7. Ovules.
How are the different parts of the plant reproductive system function to carry out sexual reproduction?The stamen is composed of anthers and filaments and is responsible for making the male gamete. The pistil is the female reproductive part of the flower and it is divided into three parts namely stigma, ovary, and style. It produces the female gamete. The primary function of the flower involves the production of male and female gametes and it carries out the process of sexual reproduction in plants.
The process of meiosis is used to produce the gametes. It occurs in the anther and ovary which are the reproductive parts of the plant. Fertilization takes place in the ovary in plants.
The pollens are produced in the anthers of the flower. The egg cells are produced by the ovules of the ovary.
To learn more about the ovary, refer to the link:
https://brainly.com/question/22265015
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which ocean zone has the most abundant primary producers and why
Answer:
the epipelagic zone ,due to its high light availability and warm water temperatures.
The theory of evolution through natural selection is considered a scientific theory because _____. See Concept 22.3 (Page 475) The theory of evolution through natural selection is considered a scientific theory because _____. See Concept 22.3 (Page 475) it is broad enough in scope to explain many observations it is supported by a massive body of evidence from many disciplines it is general enough to provide many testable hypotheses All of the above are correct. None of the above is correct.
Answer:
All of the above are correct:
it is broad enough in scope to explain many observations it is supported by a massive body of evidence from many disciplines it is general enough to provide many testable hypothesesExplanation:
The scientific theory is a conceptual framework used to explain facts or phenomena and to make predictions.
The theory is fundamental to science because it allows scientists to organize and understand observations.
The construction of a theory begins with a hypothesis. The scientist believes that a phenomenon occurs in a certain way, so he/she performs observations under the scientific method to prove that his/her hypothesis is valid or not valid. The systematization of the observations and the empirical data collected might derive from a scientific theory that explains the analyzed phenomenon.
A scientific theory is a knowledge that has been contrasted in several ways.
The theory of evolution has been tested in too many ways and by different disciplines, becoming one of the most strong theories. Research areas such as biology, genetics, paleontology, and geology, among others, have been tasting it and explaining many facts from it, which makes it broad enough to base on it any explanation of life.
Select the 3 reasons that can impact fertility rate in different regions.
A .Social Structures
B. Education
C. Sustainable Resources
D. Access to Medicine
Answer:
A .Social Structures
B. Education
D. Access to Medicine
Explanation:
Answer:
A B D
Explanation:
Eutrophication is caused by ___
A. Erosion
B. Pollution
C. High winds
D. Ultraviolet rays
Creating RNA from DNA
that's some cool stuffffp
Renal arteries and veins supply the kidneys with ____________
A. Medulla
B. Blood
C. Oxygen
D. Carbon dioxide
Answer:
They are supplied with blood
Explanation:
Hope this helps
Answer:
B. Blood
Explanation:
Explain why it is important to study ocean microbes with regard to the biosphere.
Answer:
Studying marine microbes is very important because it controls the major biogeochemical cycles that balance the Earth's biosphere.
Explanation:
Answer:
They are also major pillars of the biosphere. Their unique metabolisms allow marine microbes to carry out many steps of the biogeochemical cycles that other organisms are unable to complete. The smooth functioning of these cycles is necessary for life to continue on earth.
Explanation:
As the moon's shape appears to get smaller, we say that the moon is _. *
A.swelling
B.waxing
C.waning
D.disappearing
Answer:
waning
Explanation:
i think, don't quote me on that