I think verterbrates have a back bone others do not. I only THINK so.
The difference between active and passive cellular transport is that active transport requires energy for the ions and molecules to move across the cell membrane whereas passive cellular transport does not an energy input.
Answer: D. a genetic bottleneck
Explanation:
A genetic bottleneck also known as a population bottleneck is one that describes a sharp reduction in the size of a population caused by environmental events like in the above or caused by human activities.
Answer:
Oxygen for respiration and Carbon dioxide for photosynthesis
Explanation: