Answer:
wave is a disturbance that travels through space and matter transferring energy from one place to another. When studying waves it's important to remember that they transfer energy, not matter. There are lots of waves all around us in everyday life.
Answer:
These chemical reactions produce waste products such as carbon dioxide, water, salts, urea and uric acid. Accumulation of these wastes beyond a level inside the body is harmful to the body. The excretory organs remove these wastes. This process of removal of metabolic waste from the body is known as excretion.
This science is called anthropology
Answer:
Drugs can be both good and bad for you, like health drugs or anesthetics.
Some drugs CAN be addictive, alchohol can be a type of drug, cigars contain drugs, not all drugs are illegal, some drugs can be eaten.
