Answer:
Because they have the same function to swim with, but have different structures and made of different material.
Explanation:
A sudden shift in the tectonic plates of the earth
Pretty sure it's D. Mercury
Answer:
The phenotype may change constantly throughout the life of an individual because of environmental changes and the physiological and morphological changes associated with aging. Three types of natural selection, showing the effects of each on the distribution of phenotypes within a population.
