Answer:
the study of the structure, reaction, and composition of different kinds of substances
Explanation:

Answer:
walking barefoot can parastic worms enter our body.
Answer:
Prescription drugs marketed with a specific brand name by the company that manufactures it, usually the company which develops and patents it. When patents run out, generic versions of many popular drugs are marketed at lower cost by other companies.
Explanation:
Be Constructed Or Coated in an unknown substance.