Vesicle transport is a form of _.
Options:
- (A) diffusion
- (B) animals
- (C) communication
- (D) movement
- (E) direct energy
- (F) resistance
- (G) Vibrations.
- (H) motion
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Let's think first: Vesicle transport requires energy, so it is also a form of active transport. Active transport is another form of diffusion. Vesicle transport is a form of diffusion.... So the answer is [(A)]

What learns to behave through playing?
Options:
- (A) otters
- (B) bacteria
- (C) viruses
- (D) rocks
- (E) lions
- (F) animals
- (G) humans
- (H) Birds
--
Let's think first: Playing is just one of many ways that mammals and other animals learn how to behave. Mammals include lions, bears, dogs, horses, cattle and antelopes. Playing is one way that lions learn how to behave.... So the answer is [(E)]

What has radial symmetry?
Options:
- (A) peachleaf willow
- (B) sea urchins
- (C) humans
- (D) gastropod shells
- (E) A Greek letter
- (F) asymmetry
- (G) dogs
- (H) Most plants
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Let's think first: Adult echinoderms have radial symmetry. Sea urchins are echinoderms, in the same family as starfish. Adult sea urchins have radial symmetry.... So the answer is [(B)]

What organism uses their sense of smell to find a mate?
Options:
- (A) fur seals
- (B) bears
- (C) Amphibians
- (D) Fish
- (E) mammals
- (F) Butterflies
- (G) rabbit
- (H) Honey smelling bees
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Let's think first: Most salamanders use their sense of smell to find a mate. Salamanders are a type of amphibian. Some amphibians use their sense of smell to find a mate.... So the answer is [(C)]

Rivers easily dissolve nutrients and:
Options:
- (A) bacteria
- (B) chemicals
- (C) oxygen
- (D) sodium
- (E) vitamin C
- (F) glucose
- (G) a solute
- (H) a hazard
--
Let's think first: Running water is better able to dissolve oxygen and nutrients than standing water. Large, warm rivers hold populations but few occur in cold running water. Oxygen and nutrients dissolve easily in rivers.... So the answer is [(C)]

What disease is caused when mitosis is regulated?
Options:
- (A) tuburculosis
- (B) death
- (C) HIV
- (D) disease
- (E) illness
- (F) arthritis
- (G) Toxicity
- (H) cancer
--
Let's think first: Cancer is a disease that occurs when the cell cycle is no longer regulated. Mitosis is part of the cell cycle. Cancer is a disease that occurs when mitosis is no longer regulated.... So the answer is [(H)]