Gastrulation
a. changes the hollow blastocyst into a hollow embryo that has three tissue layers
b. changes the solid blastocyst into a hollow embryo that has three tissue layers
c. changes a gastrula into a blastocyst
d. changes a hollow embryo into a solid gastrula
e. stimulates labor

bc blah

explanation:

bc blah

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)