In kidney cells, charged ions like sodium and chloride are reabsorbed from the urine against a concentration gradient. which mode of cellular transport is employed here?

select one of the options below as your

a. facilitated diffusion
b. simple diffusion
c. osmosis
d. active transport

What is earths lithospheric plates interact at

2. if someone had the list of traits you provided in question 1, do you think he or she would be able to find you in a group of 1000 people? why or why not? if not, what other information encoded in your genes might distinguish you from the others in the group? what are other traits that are encoded for by dna?

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.