There are stretch receptors in the aorta and carotid arteries, and they are stimulated when blood pressure falls. if blood pressure falls, then the body would take measures to

i. make certain that the kidneys conserve water.

ii. produce urine that is clear and diluted.

iii. increase the water in blood plasma.

iv. decrease blood plasma volume.
a) i only
b) i and ii only
c) i and iii only
d) ii and iv only

Amutagen is 1: a living thing that has undergone a mutation. 2: an agent that causes a mutation in dna. 3: a mutation that has affected one gene. 4: a chemical that can poison living cells.

Here's one way to follow the scientific method. place the missing steps in the correct position in the process.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.