Answer: An antigen
Explanation:
A molecule that evokes immune response in the body of an organism is known as antigen. These substance can be protein, carbohydrates, lipids when asked for chemical nature.
Physically these substance can be dust particles, smoke, pollen grains, some food particles. Antigen can be defined as the substance that tends to produce immune response by the immune system of the body.
Hence, the correct answer is option D
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False politics & economics have to do with government not the environment but that’s pretty self explanatory
Answer:
C. four single covalent bonds
Explanation:
Carbon atoms can form four single covalent bonds.
