An embryo transitions into a fetus at about week 9 during a pregnancy.
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In the first three months the </span>embryo<span> goes through organogenesis and develops bodily organs, its heart starts beating after the fourth week, brain waves can be monitored after six weeks, and by the eighth week all major body parts are present. After the eight weeks, the embryo becomes a fetus.
(Sorry, I know these aren't the answer choices, but I hope this helps)</span>
The nervous system is comprised of two major subdivisions, the central nervous system (CNS) and the peripheral nervous system (PNS).
Answer:
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Explanation:
puberty is the period during which adolescents reach sexual maturity and become capable of reproduction.
