Through Time, the Lineage That Led to Modern Whales Shows

Multiple Choice

Through time, the lineage that led to modern whales shows a change from four-limbed land animals to aquatic animals with two limbs that function as flippers. This change is best explained by

A) natural philosophy.
B) reductionism.
C) the hierarchy of the biological organization of life.
D) natural selection.
E) feedback inhibition.