Factors that have the greatest effect on how much freshwater is available over time?

climate, geology, abstraction, poverty

Explanation:

Climate: lack of precipitation can lead to a lack of water. That is why is rain is important.

Geology can also be a factor in the availability of water. When water goes under the ground, rocks let the water enter through and make a water depot that is saved underground.

Regular cleaning of the water. Even though in some places there is enough water because of the pollution, it can’t be used.

Abstraction: it is important to have a limit when using water. If the amount of water for use is smaller than the water we get through precipitation, the quantity will be balanced.

When the country is rich, it can provide regular water inspection, while in poor countries this can be a big problem.

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.