Because he want to see the efects
Cooking an egg would result in it becoming burnt and ready to eat. The question is...could you change it and make it raw all over again? the answer is no, which means that it is a chemical change. A chemical change changes the substance completely and deals with the bonds.
They are different because the sea has moist airs and so it makes the humidity go up
SCIENCE
Answer:
Advantages of liquid culture- Liquid culture is suitable to use in test tubes to grow bacteria, and may reveal information about the oxygen(O₂) requirements of growing bacteria within. Disadvantages of liquid culture- Bacteria that grow in liquid media may not have specific characteristics.