Answer: 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.
Answer:
A
The body parts are arranged like spokes on a wheel
Bilateral symmetry is when it is as two halves. And the other two options are not types of symmetries.
D
