The substrate is the part that sticks into the active site of an enzyme.
The keystone species is the one at the bottom of the pyramid, if we look at it like a pyramid. If the grass dies, then the deer cannot get food and die, and the predator cannot eat and dies, and the whole ecosystem can fall apart.
Answer:
which plants and animals?
Explanation:
You need organisms like some are in plants and without Plants how will the animals eat
