The number of copies of a specific version of a gene divided by the number of copies of all versions of that gene. This number can be used to show the amount of biological diversity in an individual, a population, or a species. a: chromosome
b:genetic drift
c:allele frequency
d:gametes

links? do you have a link? i don't see anything?

answer;

a. sheep consumption efficiency would be reduced.

explanation;

-trophic efficiency is a measure of how much energy occurs at one level divided by the energy at the level immediately below it . trophic efficiency incorporates three types of efficiency:

-the proportion of available energy that is consumed (consumption efficiency).   it is the proportion of the available biomass that is ingested by consumers.

-the proportion of ingested food that is assimilated (assimilation efficiency).

-the proportion of assimilated food that goes into new consumer biomass (production efficiency).

-in this case, the grasshoppers would affect sheep by reducing the proportion of the available biomass that is ingested by the sheep.