During the prenatal period of development, x-rays, infections, tobacco, alcohol, and toxic substances are examples of the critical period exemplars discriminative stimuli teratogens

Teratogens

Explanation:

Teratogens are substances or or other factors that can cause congenital abnormalities. This disability is also known as birth defects.

These abnormality arise in the third week to eight week of pregnancy whwn the major organ system are forming in fetus.

Some examples of teratogens are certain chemicals, medications, tobacco, alcohol, x-rays.

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in

answer: after carbon dioxide enters the leaf through stomata it moves into the mesophyll cells where photosynthesis occurs and glucose is constructed. respiration occurs when glucose (sugar produced during photosynthesis) combines with oxygen to produce useable cellular energy.

explanation: