Answer:
The ecosystems are different
Explanation:
Every ecosystem needs most of the types, such as producers and herbivours, but different animals need different climates, such as cacti need deserts, yet fish need water, they can't( Or shouldn't ) Be in the same ecosystem due to thier needs.
D
it just is i dont know y i just know it is D
Answer: definetly A, food webs
the other options are not even related to organisms
