Question 1

why are all the people on earth members of the same biological species?

all people have the same genetic makeup.

all people originated from the continent of africa.

all people have adaptations that allow them to live anywhere on earth.

all people can mate with one another and have children.
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question 2

according to scientific thought, when does one species of organisms become two species?

when populations become separated from one another

when one population becomes extinct

when one population cannot interbreed with the other population

when populations compete for the same resources
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question 3

which stage is the middle stage of speciation?

the populations become adapted to different environments and eventually become so different that they cannot interbreed to produce fertile offspring.

the populations are isolated and thus do not interbreed.

the populations become totally separated from one another.

the populations successfully interbreed.
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question 4

which stage is the first stage of speciation?

the populations become adapted to different environments and eventually become so different that they cannot interbreed to produce fertile offspring.

the populations are isolated and thus do not interbreed.

the populations become totally separated from one another.

the populations successfully interbreed.
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question 5

the colorado river carved out a deep canyon in the habitat of an abert’s squirrel population. this is an example of which stage of speciation?

the populations become adapted to different environments and eventually become so different that they cannot interbreed to produce fertile offspring.

the populations are isolated and thus do not interbreed.

the populations become totally separated from one another.

the populations successfully interbreed.