There is an island in the middle of a large river that houses a large population of ants. Damming of the river causes the isla to flood and only the highest points of the island are now above water. The ants cannot swim, so are now in multiple isolated populations. Which of the following best describes this event? A. This situation represents isolation by dispersal. B. This situation represents isolation by vicariance. C. This situation represents a form of sympatric speciation. D. Speciation will not occur in this case because of gene flow.

B. This situation represents isolation by vicariance

Explanation:

Vicariance is a process by which the large geographical area is distributed in a small area by the formation of a barrier. This process distributes the large population in into small population due to the formation of the barrier which does not allow the gene flow.

In the given question, the ants live on the island of the river and the formation of a dam increases the water level during the flood. Only the highest point of the island appears which leads to the separation of the population of the ants. This is the case of the Vicariance.

Thus, Option-B is correct.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.