DNA is comprised of four different types of . Each one is made up of a pentose , a group, and one of four . 2. Adenine, guanine, cytosine and thymine are . 3. Adenine and guanine, which have a nine-member double-ring, are called . 4. Cytosine and thymine, which have a six-member single-ring, are called .

1)  Nitrogenous bases

2) Nucleotides

3) Purines

4) Pyrimidines

Explanation:

1) Each one is made up of a pentose , a group, and one of four Nitrogenous bases

2) Adenine, guanine, cytosine and thymine are Nucleotides

3. Adenine and guanine, which have a nine-member double-ring, are called Purines

4. Cytosine and thymine, which have a six-member single-ring, are called Pyrimidines

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)

atp is used for energy.