What is a teratogen? An aspect of an individual's personality believed to be biologically based A highly specialized nerve cell responsible for communicating information An automatic response or movement that is not consciously controlled An environmental factor that can harm a developing embryo or fetus

An environmental factors that can harm a developing embryo and fetus.

Explanation:

Teratogens are kind of agents that create disturbance to the developing fetus or embryo or may create birth defects in a child.

Teratogens may be a drug, or chemicals or radiation and material infection.

It halt pregnancy or form congenital malformation.

They are environmental factors which results in permanent structural and functional malformation that in turn leads to death of the embryo.

Some example of potential teratogens are-

Caotopril,lisinoprils,ramipri,alcohols,antibiotics such as tetracycline,doxycycline,streptomycin,wrfarin,seizure medicines,phenytoin,valptoic acid,carbamazepine,anti cancer or anti metabolite drugs like methotrexate,penicilline,depen ,anti thyroidal drugs such as thiouracil,carbimazole etc.

the correct answer is:

a population changes in response to a change in the environment.