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each population of squirrels evolved different adaptations for each side of the canyon and eventually became genetically different populations. this is an example of which stage of speciation?

a) the population became adapted to different environments and eventually become so different that they cannot interbreed to produce fertile offspring.

b) the populations have been isolated and thus do not interbreed.

c) the populations become adapted to different environments but will still be able to interbreed, but the offspring will not be fertile.

d) the populations become totally separated from one another.

A) The population became adapted to different environments and eventually become so different that they cannot interbreed to produce fertile offspring.

According to the given situation, the canyon is a geographical barrier between the two populations. The separation of the species of squirrel has resulted in the speciation because both of the populations have adapted according to the surrounding environments. The members of the separated populations have evolved in such as manner that they are incapable of inbreeding due physical, and biological barriers, as consequence of speciation.

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.