7. In the biosphere, a. both trees and animals emit oxygen
b. trees emit oxygen and animals consume oxygen
c. animals emit oxygen and trees consume oxygen

B

Explanation:

Trees release oxygen which is a product of photosynthesis which animals use for cellular respiration

1. a host loses nutrients to a parasite

2. a parasite only benefits when the host is alive (cause if the host dies the parasite dies with it )

3. producers to consumers

4. the tapeworm is a parasite

5. they convert energy from the sun (photosynthesis)

6. sunflower-robin (i think im 80% sure)

7. producer

8. consumer

9. prey

10. fresh water snails ( cause the green algea is the producer and the snails are the primary consumers and the small fish consumer so is the big fish)