The cell membrane that helps to control what enters and leaves a cell is the outer boundary of the cytoplasm
Explanation:
medulla oblongata......oks.......
All DNA is remarkably similar, but some more than others. Humans' DNA would be closer to other mammals' than it is to, say, a bird. Using DNA shows how varied an animal really is from another. Specific parts of the DNA code for different things, so you might see a similar structure for wings and flippers.
The smallest unit is species