Horses went extinct in North America and did not return until they were ferried in boats by European settlers (no land mammal can swim on its own across an ocean). From a horse's perspective, the ocean barrier is best described as what?A. Acorridor. B. A filter. C. A sweepstakes route.

C. A sweepstakes route.

Explanation:

In biology, the movement of species in space is known as dispersal. A sweepstakes route is the least favorable dispersal mechanism by which a species migrate from place to place. This concept was developed by Simpson (1940) in order to describe a possible migration pathway which is unlikely but not impossible, thereby being used by some organisms. This route depends on the presence of a major barrier that is very difficult to cross, although it is occasionally crossed (such as, in this case, the ocean barrier).

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.