1. Secondary succession is usually the response after a small disturbance. 2. is the only constant.

3. Ecosystems were believed to continue to change until they reached a .

4. never happens in an ecosystem.

5. An ecosystem is in later successional stages if it has biodiversity.

6. The type of disturbances that have the greatest effect on biodiversity are disturbances.

What is a difference between systemic and pulmonary circulation? a. systemic circulation carries oxygenated blood to the lungs and pulmonary circulation carries deoxygenated blood to the body. b. systemic circulation carries deoxygenated blood to the lungs and pulmonary circulation carries oxygenated blood to the body. c. systemic circulation carries deoxygenated blood to the body and pulmonary circulation carries oxygenated blood to the lungs. d. systemic circulation carries oxygenated blood to the body and pulmonary circulation carries deoxygenated blood to the lungs.