What is one thing most single-celled organisms have in common?
Options:
- (A) Energy
- (B) glucose
- (C) bacteria
- (D) motility
- (E) Energy.
- (F) heat energy
- (G) resistance
- (H) warmth
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Let's think first: Most protists have motility. Protists Protists are single-celled organisms. Most single-celled organisms are motile.... So the answer is [(D)]

What is the result of a dolphin keeping a high metabolism rate?
Options:
- (A) generate blood cells
- (B) generate heat
- (C) overheating
- (D) develop cancer
- (E) kinetic energy
- (F) aerobic capacity
- (G) exercise
- (H) Energy.
--
Let's think first: Mammals generate heat mainly by keeping their metabolic rate high. All dolphins are mammals and all mammals breathe air. Dolphins generate heat by keeping their metabolic rate high.... So the answer is [(B)]

What can polar bears do to generate heat?
Options:
- (A) make fire
- (B) eat ice
- (C) stay warm
- (D) nothing
- (E) fur
- (F) motors
- (G) shiver
- (H) sweating
--
Let's think first: Mammals can also generate little bursts of heat by shivering. Polar bears are mammals. Polar bears can generate heat by shivering.... So the answer is [(G)]

What type of trunk does evergreen usually have?
Options:
- (A) oak
- (B) greenwood
- (C) woody
- (D) bark
- (E) hollowed
- (F) Spruce
- (G) spiny
- (H) bent
--
Let's think first: Most modern gymnosperms are trees with woody trunks. Gymnosperms are the plants that are known as evergreens. Evergreens are mostly trees with woody trunks.... So the answer is [(C)]

What do nephrons filter?
Options:
- (A) Blood
- (B) matter
- (C) solutes
- (D) Energy
- (E) SO2
- (F) Gases
- (G) Energy.
- (H) cations
--
Let's think first: Nephrons are the structural and functional units of the kidneys. Blood is filtered in the kidney. Nephrons filter blood.... So the answer is [(A)]

What species of female mammal lacks a uterus and vagina?
Options:
- (A) fallopian tubes
- (B) echidna
- (C) live birth
- (D) lays eggs
- (E) cows
- (F) tortoises
- (G) alpacas
- (H) goats
--
Let's think first: Female monotremes lack a uterus and vagina. Examples of monotremes are the Platypus and Echidna. Platypus and echidna lack a uterus and vagina.... So the answer is [(B)]