How are atoms held together in molecules? A. They combine to form polymers
B. They form covalent bonds
C. They break hydrogen bonds
D. they form ions

B

Explanation:

Atoms are held together with chemical bonds, and also known as covalent bonds.

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)

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.