Question

36. Describe the following
a) Natural selection
b) Genetic drift
c) Geographical barriers
d) Speciation​

Answer 1

Answer:

A)Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.

B)Genetic drift is the change in the frequency of an existing gene variant in a population due to random sampling of organisms. The alleles in the offspring are a sample of those in the parents, and chance has a role in determining whether a given individual survives and reproduces

C) geographical barrier can be a mountain range, a large canyon, a body of water, or large expanses of climatic differences (e.g., a desert). Allopatric speciation is a mechanism of speciation that is initiated by the physical separation of one population into two or more physically isolated population

D)Speciation is the evolutionary process by which populations evolve to become distinct species. The biologist Orator F. Cook coined the term in 1906 for cladogenesis, the splitting of lineages, as opposed to anagenesis, phyletic evolution within lineages.

hope it helps

please mark brainliest

Answer 2

genetic drift is caused by natural selection