Is phenotypic variability reversible or irreversible? IS genotypic variablity reversible or irreversible?

What is one benefit of a nonrenewable resource, such as natural gas? a. generate large amounts of electricity b. less expensive overtime c. produces pollution d. will run out eventually

Cells control gene expression at which steps

Hairs that clean dirt out of the air in your nasal passages are called: a. sinus b. trachea c. cilia d. mucus