The offspring of two koalas develops a genetic disease. When scientists studied the parents' DNA, they found that both parents carried harmful recessive genes passed down from the exact same lineage. Which process contributed to the offspring's genetic disorder?

A. biomagnification

B. eutrophication

C. inbreeding

D. predation

The correct answer is option C which is inbreeding.

Explanation: The genetic disease is due to the homozygous recessive alleles in genotype. This happens due to the inbreeding which is the process of breeding of interrelated or closely related species. Due to which the some alleles reappear in generations, with chances of one genotype is increased. In this situation, the genotype of two recessive alleles appear due to inbreeding.

The answer is C. inbreeding

İnbreeding results in homozygosity, which can increase the risk of the koalas being affected by the genetic disorder.