Answer:
I say A they were mostly from Europe
Explanation:
Sinlge-celled organisms and soft, boneless animals. Back then organisms were single-celled and simple.
I'm pretty sure it's answer D. It's the only answer choice that really makes sense.
Answer:
Moving things in and out of the cell is an important role of the plasma membrane. It controls everything that enters and leaves the cell. There are two basic ways that substances can cross the plasma membrane: passive transport, which requires no energy; and active transport, which requires energy.
