What are the key cells in an allergy attack?
Options:
- (A) layers of fat
- (B) Lymphocytes.
- (C) fur and fat
- (D) bone cells
- (E) muscle cells
- (F) the skin
- (G) Red blood cells
- (H) animals
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Let's think first: Lymphocytes are the key cells involved in the immune response. An allergy attack is an immunal response. Lymphocytes are the key cells involved in an allergy attack.... So the answer is [(B)]

What occurs with the stopping of menses?
Options:
- (A) puberty
- (B) illness
- (C) period
- (D) menopause
- (E) sweating
- (F) acetic acid
- (G) Dehydration
- (H) adulthood
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Let's think first: Menopause occurs when menstruation stops occurring, usually in middle adulthood. White bryony is used for suppressed menses, menstruation too early and too profuse. Menopause occurs when menses stop occurring, usually in middle adulthood.... So the answer is [(D)]

An animal that travels long distances is
Options:
- (A) brown bear
- (B) dangerous
- (C) Riding a bike
- (D) warm-blooded
- (E) a barn swallow
- (F) supersonic
- (G) ground squirrel
- (H) mountain gorilla
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Let's think first: Migrants typically travel long distances. Barn swallows are Neotropical migrants. Barn swallows travel long distances.... So the answer is [(E)]

All chemical reactions require a form of what to get started?
Options:
- (A) oxygen
- (B) celestial measurement
- (C) gas
- (D) heat
- (E) UV
- (F) charge
- (G) Light
- (H) scientific expression
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Let's think first: All chemical reactions require activation energy to get started. Basically, heat is energy. All chemical reactions require heat to get started.... So the answer is [(D)]

Temperature and pressure receptors in most animals are located:
Options:
- (A) Veins and arteries.
- (B) in one limb each
- (C) in the same organ
- (D) an organism's body
- (E) it keeps an organism warm
- (F) in two different organs
- (G) in plants
- (H) frontal zones
--
Let's think first: Pressure receptors are found mainly in the skin. Temperature sensors in vertebrates are located in the skin and in the hypothalamus. Temperature and pressure sensors are located in the same organ in most animals.... So the answer is [(C)]

The gene pool expands through fertilization and:
Options:
- (A) offspring
- (B) agriculture
- (C) mutation
- (D) babies
- (E) seeds
- (F) zygotes
- (G) relocation
- (H) competition
--
Let's think first: Mutation creates new genetic variation in a gene pool. Fertilization increases genetic variation. Mutation and fertilization have similar effects on the gene pool.... So the answer is [(C)]