The major effect of genetic drift is a) a reduction in genetic variability. b) a increase in genetic variation to accommodate changes in abiotic conditions. c) no change in population size but an increase in favorable alleles. d) a reduction in population size and an increase in genetic variability.

The correct answer would be A)a reduction in genetic variability.

Genetic drift refers to the random event by which the allele frequencies in a population get changed.

It is mainly caused by sampling error in selecting alleles to be passed on to the next generation.

It usually results in the loss of genetic variation due to the death of organisms which are carrying the variable alleles.  

It has major effects on the genetic variation when it is complemented with a bottleneck effect or founder effect.

a

Explanation:

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)

fkk you n*gga