C, we receive 50% of your DNA from each of your parents, who received 50% of theirs from each of their parents, and so on...
The answer is D) enzymes.
“Enzymes are protein catalysts. A specific region of an enzyme where a substrate binds and catalysis takes place.”
Most species have fingernails instead of claws and they have touch-sensitive pads on each of their digits. The hands and feet of all primates, except for humans, are designed for grasping. Humans have hands designed for grasping, but not feet! Humans have opposable thumbs
Each animals gas exchange systems work in different environments because in order to be successful in that specific environment, That specific organism had to adapt to its surroundings. Therefore causing the fish to overtime adapt and grow gills so it could be more successful in it's environment. <span />