How is an electromagnet different from a permanent magnet?

a. it has only north magnetic poles.
b. it has only south magnetic poles.
c. there is no magnetic field.
d. it can be turned on and off.

i dont know this but ask your teacher for !

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)

the correct option is option d

correct answer is a. and d.