Insulin is a hormone that helps absorb what from the blood?
Options:
- (A) hormones
- (B) blood cells
- (C) glucose
- (D) Energy
- (E) water
- (F) Energy.
- (G) Joules
- (H) hydration
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Let's think first: Insulin is a hormone that helps cells absorb sugar from the blood. Blood Sugar Glucose is sugar. Insulin is a hormone that helps cells absorb glucose from the blood.... So the answer is [(C)]

What occurs when muscles contract and propel male gametes?
Options:
- (A) fertilization
- (B) sex
- (C) ejaculation
- (D) electrically
- (E) rapid expansion
- (F) motion
- (G) competition
- (H) intercourse
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Let's think first: Ejaculation occurs when muscle contractions propel sperm from the epididymes. Male gametes are called sperm. Ejaculation occurs when muscle contractions propel male gametes.... So the answer is [(C)]

Electron transport requires which of the following?
Options:
- (A) electron microscope
- (B) sodium
- (C) Energy.
- (D) Oxygen
- (E) fission
- (F) warmth
- (G) flagellum
- (H) Energy
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Let's think first: Electron transport is the final stage of aerobic respiration. Aerobic respiration occurs only in the presence of oxygen. Electron transport occurs only in the presence of oxygen.... So the answer is [(D)]

What clusters around the heat of submarine volcanoes?
Options:
- (A) ferns
- (B) organisms
- (C) vegetation
- (D) humans
- (E) emissions
- (F) Energy
- (G) insects
- (H) the sun
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Let's think first: Organisms cluster around hydrothermal vents in the ocean floor. Hydrothermal vents are powered by the heat of submarine volcanoes. Organisms cluster around the heat of submarine volcanoes.... So the answer is [(B)]

Flower spores eventually develop into an entity that is:
Options:
- (A) sperm
- (B) fertile
- (C) mammalian
- (D) ferns
- (E) fungi
- (F) development
- (G) haploid
- (H) plants
--
Let's think first: Flowers produce spores that develop into gametophytes. All gametophytes are haploid. Flowers produce spores that develop into haploid entities.... So the answer is [(G)]

Biomass is the total mass of what at a trophic level?
Options:
- (A) Plants growth
- (B) peachleaf willow
- (C) Conifers
- (D) animals
- (E) living things
- (F) Most plants
- (G) all matter
- (H) insects
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Let's think first: Biomass is the total mass of organisms at a trophic level. An organism is a living thing. Biomass is the total mass of living things at a trophic level.... So the answer is [(E)]