What increases the frequency of adaptive mutations in a population over time

Natural selection

Explanation:

Natural selection is the process via which the frequency of adaptive mutations in the population increases. In adaptive mutations, the mutational changes that are caused through natural selection, make individual to survive better in that particular environment when passes through stress conditions like temperature, drought etc. through natural selection the fittest of all is selected (the one that had adapted in that environment).

texas-flood watch and coastal flood barriers

california-try and look for under ground water stream

the answer is d (apex) good luck : ))