What do all cells share?
Options:
- (A) basic function
- (B) Veins and arteries.
- (C) exact structure
- (D) how they look
- (E) energy usage
- (F) Electrical energy
- (G) types of protein
- (H) Chemical energy
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Let's think first: All cells share some of the same structures and basic functions. Biological structures are too complex. Cells are complex but all share basic functions.... So the answer is [(A)]

What does immunization cause?
Options:
- (A) amino acids
- (B) sweating
- (C) immunoglobulin deficiency
- (D) nutrition
- (E) resistance
- (F) recovery
- (G) fever
- (H) immunity
--
Let's think first: Immunity results from immunization. An effect is the result or outcome of some cause. Immunization causes immunity.... So the answer is [(H)]

What do mussels eat?
Options:
- (A) bivalves
- (B) sub-units of species
- (C) Something coming from a gland
- (D) mussels
- (E) plankton and nonliving organic
- (F) Something made from fermented ricce
- (G) mollusks
- (H) Microscopic organisms
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Let's think first: Bivalves feed on plankton and nonliving organic matter. Mussels are bivalve mollusks. Mussels eat plankton and nonliving organic matter.... So the answer is [(E)]

Most ecosystems get energy from what in the atmosphere?
Options:
- (A) fires
- (B) Sun
- (C) wind
- (D) summer
- (E) oxygen
- (F) Light
- (G) heat
- (H) H20
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Let's think first: Most ecosystems get energy from sunlight. On Earth, energy from sunlight heats the atmosphere more at the equator than at the poles. Most ecosystems get energy from heat in the atmosphere.... So the answer is [(G)]

What forms in shallow tropical water?
Options:
- (A) ocean
- (B) romance
- (C) bushes
- (D) ferns
- (E) reefs
- (F) bamboo
- (G) fossils
- (H) snorkelling
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Let's think first: Corals form large colonies in shallow tropical water. Huge colonies of hard corals form coral reefs . Reefs form in shallow tropical water.... So the answer is [(E)]

Many consumers feed at more than one what?
Options:
- (A) ground level
- (B) kinetic energy
- (C) major threat to health
- (D) level of sound
- (E) eat plants or other animal
- (F) level on the pyramid
- (G) level of height
- (H) Inches or fractions of inches.
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Let's think first: Many consumers feed at more than one trophic level. Each level on the pyramid represents a trophic level. Many consumers feed at more than one level on the pyramid.... So the answer is [(F)]