Complementary DNA (cDNA) is a DNA copy of a messenger RNA (mRNA) molecule produced by reverse transcriptase, a DNA polymerase that can use either DNA or RNA as a template.
Answer:
Fertilization-the action or process of fertilizing an egg, female animal, or plant, involving the fusion of male and female gametes to form a zygote.
Explanation:
This means that the answer is The fusion to two cells to form one single cell known as the zygote
Studies of populations that reveal correlations between dietary habits and disease incidence are epidemiological studies.