What would happen if a disease killed off the top level of an ecosystem?

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

14) whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.

Which of the following organisms are capable of self-fertilization? a.plants b.tigers c.humans