Ques and Ans: Biomass is the total mass of living things at each what?
Options:
- (A) trophic level
- (B) important habitats
- (C) Energy.
- (D) food and shelter
- (E) Power plants
- (F) animals
- (G) body water
- (H) heat energy
(A)
Explanation for the Ans above: [[Biomass is the total mass of organisms at a trophic level. Most living things are called organisms. Biomass is the total mass of living things at a trophic level.]]

Ques and Ans: Which of the following do not grow using mitosis?
Options:
- (A) skin cells
- (B) genus
- (C) fungi
- (D) lung cells
- (E) blood cells
- (F) parasites
- (G) viruses
- (H) bacteria
(G)
Explanation for the Ans above: [[Populations of viruses do not grow through cell division because they are not cells. Mitosis is cell division. Populations of viruses do not grow through mitosis because they are not cells.]]

Ques and Ans: What is secreted by organisms like frogspawn to become a reef?
Options:
- (A) exocrine glands
- (B) food and shelter
- (C) exoskeleton
- (D) bones
- (E) Energy
- (F) Chemical energy
- (G) plasma
- (H) Energy.
(C)
Explanation for the Ans above:
[[Many corals secrete an exoskeleton that builds up to become a coral reef. Good examples are Bubble coral, Elegance coral, Frogspawn and other Euphyllia corals. Organisms like frogspawns secrete an exoskeleton that builds up to become a reef.]]