q: What do organisms use carbon, oxygen, and hydrogen for?
Options:
- (A) agriculture
- (B) It helps them survive
- (C) to destroy energy
- (D) survival
- (E) to store energy
- (F) to waste energy
- (G) heat produced
- (H) to release energy
a: (E)... Explanation: Organisms use lipids to store energy. Lipids Lipids are also composed of carbon, oxygen and hydrogen. Organisms use carbon, oxygen, and hydrogen to store energy. That's why the answer is (E).

q: What does a hairy organism have under its skin to help insulate the body?
Options:
- (A) fat
- (B) hair
- (C) food
- (D) cell
- (E) nerves
- (F) coat
- (G) fur
- (H) marrow
a: (A)... Explanation: Mammals have a layer of fat under the skin to help insulate the body. If it has hair it is a mammal. An organism with hair has a layer of fat under the skin to help insulate the body. That's why the answer is (A).

q: Cacti are adapted to what?
Options:
- (A) the snow
- (B) dry environments
- (C) Animal survival
- (D) survival
- (E) tropical regions
- (F) moist environments
- (G) relocation
- (H) salt and water.
a: (B)... Explanation: Plants that are adapted to very dry environments are called xerophytes. Succulents, bromeliads and cacti are xerophytes. A plant that is adapt to a very dry environment is a cacti. That's why the answer is (B).

q: Are there organisms simpler than cells.
Options:
- (A) DNA
- (B) plankton
- (C) tiny
- (D) algae
- (E) amoeba
- (F) RNA
- (G) yes
- (H) food
a:
(G)... Explanation: Viruses are not cells. Viruses Viruses are the simplest organisms known. Cells are not the simplest organisms. That's why the answer is (G).