How does it help the reader to know the thoughts, feelings, and actions of all the characters in this story?

A). It helps the reader by showing how the behavior of Echo and
Narcissus made the goddesses decide to punish them.
B). It helps the reader by showing that the goddesses decided to punish
Echo and Narcissus without good reason.
C). It helps the reader by showing that mortals, like Echo and Narcissus,
had power over the gods and goddesses.
D). It helps the reader by showing how much Echo loved Narcissus and
how her love was not returned.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.