A segment of DNA that codes for the ability to make one type of protein molecule is known as a(n)
axon
codon
gene
intron

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

How many major plates cover the earth

Which is an important function of normal flora? a. aid with bone marrow production. b. crowd out pathogenic bacteria. c. destroy digestive track pathogens. d. manufacture iron in the bloodstream.