Imagine a population of moths. white moths are easier for birds to see and eat. gray moths blend into their surroundings, so they are less visible to birds than white moths. as a result, gray moths are more likely to survive and reproduce, enabling the gene for gray coloration to be passed on to the next generation. this increases the frequency of genes for gray coloration in the population. which evolutionary process does this scenario describe?

Natural section  

Explanation:

This is natural selection through directional selection,  because the frequencies of  gray  allele  traits  for selection is higher than the white. Therefore; they were more fitted in the population, to withstand the selective pressure ;birds and subsequently passed these traits down to their offspring.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.