Two squirrel varieties (the Abert squirrel and the Kaibab
squirrel) have a common ancestor that lived in Northern
Arizona. About 10,000 years ago, the Grand Canyon was
carved out of land in Northern Arizona, leaving populations
of the ancestral squirrel species separated from one
another. Today, in the area of the Grand Canyon, the Abert
squirrel lives only on the canyon's south rim, while the
Kaibab squirrel lives on the north rim.

What type of speciation has occurred between these two varieties of squirrels?
A. Reproductive isolation
B. Disruptive selection
C. Temporal isolation
D. Behavioral isolation
Tan

B. Disruptive Selection

Explanation:

the population is divided into two distinct groups, or is disrupted so the gentics start to vary between the separted populations over time.

answer by yourhope:

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human impact on the environment can be seen in the deterioration of the !

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in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: