HELPPP 12. A researcher uses several procedures to separate a rock sample into different
chemicals. A mass of 50 grams of one chemical is produced. If this chemical cannot be
separated into other chemicals, then it is best described as
A. a compound.
B. a mixture.
C. a solution.
D. an element.

If a chemical can no longer be separated into other chemicals, it can be said that it is d. an element. This is because elements are the purest substances out there. Rocks are mixtures that are made of inerts and various minerals which are compounds. Compounds are then composed of elements.

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)