The nurse is teaching her patient about possible teratogen exposure during pregnancy. She correctly explains to her patient that teratogens are harmful agents that can cause fetal malformations. She also correctly explains that. Select all that apply.

Teratogens can be chemicals, medications, or viruses.

The fetus is most susceptible to teratogens during the embryonic stage.

If exposure to teratogens occurs during weeks 2-8 (postconception age) or 4-10 (gestational) of a pregnancy, fetal malformations can occur due to the effect of these substances on the normal development of body systems.

The fetus is most susceptible to teratogens during the fetal stage.