After a forest fire, there was a severe drop in the population size of koala bears. Which of the following describes the gene pool of the remaining survivors? A) A selective process caused an increase in the population's genetic variation.
B) The founder effect caused the chance event that altered the allele frequency.
C) Bottleneck effect led to over-representation of certain alleles in the new gene pool decreasing genetic diversity.
D) Gene flow led to an increase in the gene pool's allele frequencies.

amber has allowed scientists to study dna that has been preserved over millions of years.

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers