Other scientists hypothesize that organic compounds could have come to

1 point
a.
riding on meteorites

b.
when stars collide and debris falls to earth

c.
primitive plants performing photosynthesis

d.
from the dust off of neighboring planets

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 tricuspid valve is present between right atrium and right ventricle