Dna strand: g g a a t c t c g
mrna codons:
trna anti-codons:

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

At which location in earth’s interior does the top density continue to increase as thickness decreases?

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.