A population of rabbits with typical variations of traits lives in a meadow with a depression that runs through the middle. Over time, the depression fills in with water and becomes a river, separating the one population into two over a period of several years. This is an example of:

Allopatric speciation

Explanation:

Allopatric speciation is a form of gradual process of evolution, in which a population of a common species evolves to form different species as a result of being isolated from each other geographically. As a result of the separation of one population of rabbits from the others caused by the river, over time, forces of natural selection and genetic drift will cause the two populations to evolve differently and thereby resulting in two new different species with genetic differences.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

c is the correct answer hope this !