1. Which of the following is NOT a freshwater ecosystem?

2. What type of organism is at the basis of all food chains?

3. A population is made up of individual members of the same

4. What type of species interaction directly benefits both species involved?

5. An animal that eats only plants is a(n)

6. How do consumers always obtain energy?

7. What will most likely happen if two species compete for the exact same resources in the same ecosystem at the same time?

8. Which of the following is an example of parasitism?

9. An herbivore is a

10. Tiger sharks could be considered a keystone species because they

11. When communities form in previous uninhabited areas, this is called

12. Common decomposers include

13. How do abiotic factors and biotic factors differ?

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