Answer:
Each cell has a unique chemical composition
Explanation:
All the other answers are apart of the modern cell theory.
Answer:
Killer T cells release enzymes that help destroy invading foreign matter (antigens), Helper T cells, on the other hand, stimulate another type of lymphocyte known as B cells. B cells produce antibody, which is a protein made in response to a specific antigen.
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(D)an atom can join with other kinds of atoms.
Basically he explained what a molecule is.
1. B
2. B
3. C
4. C
5. D
6. C
7. C
8. D
9. C
