Answer:
An embryo is the early stage of human growth in which the vital body structures of organs are developed. In the 11th week of pregnancy, which is the 9th week of development after egg fertilization, an embryo is considered a fetus.
Explanation:
The ultimate source of energy is sunlight, and living things must break the sunlight down using their own methods to use it.
Answer: Endocrines: Adrenal, Pineal
Explanation: Endocrine glands are hormones.
<span>A stimulus is the reaction of something in a given environment.</span>
