Answer:most bones start off as cartilage models
Explanation:
Answer:
Explanation:
Active cellular transport:
- It is the movement of molecules against the concentration gradient (from low concentration to high).
- Active transport requires expense of energy supplied by ATP.
- It is a rapid way to transport of large sized molecules.
Passive cellular transport:
- It is the movement of molecules along the concentration gradient (from high concentration to low).
- Passive transport does not require expense of energy.
- It is a slow process and small sized molecules get transprorted.
The structure labeled X in the diagram is a membrane protein.
The human skin that contains blood vessels, nerves, and glands is called the dermis.
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