Question

why do organisms that are separated from the original group sometimes become a new species through speciation? their genes are isolated from the original group. they actually do not change, at all. they simply want to change so they do change.

Explanation:

Speciation occurs when a group of organisms becomes reproductively isolated from the original population. This isolation can be due to geographical separation (allopatric speciation) or other factors. When genes are isolated, different evolutionary pressures (like different environments, resources, or selection pressures) act on the separated group. Over time, mutations, genetic drift, and natural selection occur independently in the isolated group compared to the original. These processes lead to the accumulation of genetic differences. Eventually, these differences become so significant that the isolated group can no longer interbreed with the original group (biological species concept - inability to produce fertile offspring when mating), thus forming a new species. The option "They actually do not change, at all" is incorrect because evolution (including speciation) is based on change over time. The option "They simply WANT to change so they do change" is incorrect as evolution is not a matter of conscious "wanting" - it is driven by natural processes like those mentioned (mutations, genetic drift, natural selection).

Answer:

Their genes are isolated from the original group.