This is called active transport. The proteins use ATP to transport stuff in and out of the cell.
What are your choices? Pteranodon means wing without tooth.
I don’t really understand this question can you go more into detail
Answer:
Cells
Explanation:
Cells are the smallest living unit, but atoms are the smallest unit of the above choices... Cells are made of atoms... But you asked about the Smallest unit of life so I don't know if you are asking about the smallest unit ever or the smallest unit in the living things
The earth is cooled and its atmosphere is heated by terrestrial radiation.
