The hair, skin, and nails are part of the integumentary system. This system grows from biotin.
Answer: D) Integumentary
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Answer:
The 3rd Option
Explanation:
Simple for this question, C: an investigation because it uses only observations.
We get tired after exercise because our muscle fibers get tired very quickly. This is due to the major source of energy for the muscle tissue, called adenosine triphosphate, or ATP. As the muscles make use of this supply of energy, they get tired and fatigue.
C. minor strains and sprain
