1. which of these things does a cell not contain?
- Cell membrane
- Cell wall
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2. A group of cells is called a
3. Which of these things does an organ not need to function in the human body?
- Blood supply
- Protection from the skeletal system
4. A group of tissues is called
- A body
- A heart
- An Organ
- A cell
5. A group of organs is called a
- Organ machine