Caffeine is a widely known chemical compound that acts as a stimulant on the Central Nervous System.

Here are the answers to your biology questions:

8. Caffeine is a widely known chemical compound that acts as a stimulant on the Central Nervous System.

   • C) Caffeine

9. Malaria is an infectious disease caused by a parasite transmitted through mosquito bites. Kwashiorkor, Scurvy, and Rickets are deficiency diseases.

   • C) Malaria

10. Both Starch and Glycogen are complex carbohydrates classified as polysaccharides. Assuming "BBC" is a typo for "B and C".

    • D) B and C

11. Proteins are polymers made up of smaller repeating units called amino acids.

    • B) Amino acids

12. A lack of iron in the body leads to iron-deficiency anemia. Among the given options, "Iron" is likely a shorthand or typo referring to this condition.

    • D) Iron

13. Tetrahydrocannabinol (THC) is the primary psychoactive compound found in cannabis, responsible for its effects on the central nervous system.

    • B) Tetrahydrocannabinol