Most simple invertebrates obtain their oxygen by diffusion directly from the surrounding

WATER

Explanation:

The options attached to this question are given below:

A. Mud.

B. Water.

C. Blood.

D. Air.

Generally, simple invertebrate organisms have simple body structures, which allow exchange of gases to occur through the process of diffusion. Diffusion is a process by which substances are transported from the region of higher concentration to the region of lower concentration. Most simple invertebrates lives in water and they obtain the oxygen they need for survival through the process of diffusion; the oxygen gas diffuse into their body system and the carbon dioxide is also eliminated through the same process.

we would need to see the picture to answer it

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)