The individual genotypes in a breeding population, taken as a whole, are the

The individual genotypes in a breeding population, taken as a whole, are the gene pool.

A gene pool can be described as a collection of different genes(includes both genes expressed, and not expressed) within an interbreeding population. Definition of the gene pool can also be: the sum of all the alleles at all of the loci within the genes of a population of a single species.  

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)