It is a vestigial Structure.
Explanation:
Solar power because it is never ending and has no emmisions
- Energy
"Matter is recycled, but energy is not. In an ecosystem, matter is represented by the presence of biogeochemical elements such as Hydrogen, Carbon, Nitrogen, Oxygen, Phosphorus and Sulfur."
The fifth week of pregnancy is considered part of the embryonic stage of prenatal development.
Zygote and Germinal
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