Phenotype.
It is the compound of observable characteristics or traits of an organism.
Answer:
One of the key molecules in DNA replication is the enzyme DNA polymerase. DNA polymerases are responsible for synthesizing DNA: they add nucleotides one by one to the growing DNA chain, incorporating only those that are complementary to the template.
Explanation:
No more than five trophic levels are present in an ecosystem, most have only 4.