Which describes the particle or particles that are in the nucleus of an atom? *
1. proton and electron

2.electron only

3.electron and neutron

4.neutron and proton

    Nevermind! I don't know if you can delete your answer or not but I saw that mine was wrong. Sorry!

cell regulation is conducted by special proteins.

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)