Answer:
While protozoans evolved early and have survived to the present day as unicellular organisms, they have undoubtedly undergone considerable evolutionary change. So the role they have is rather big because they where here from early days. Animals could of adopted and learned from them
Explanation:
Answer:
I think it's A) A protein substrate
Answer:
That looks hard, search on google.
Explanation:
Glucagon. It stimulates the liver to convert stored glycogen to glucose.