What is critical?
Options:
- (A) Balance
- (B) oxygen
- (C) recovery
- (D) Electrical
- (E) heat
- (F) sun's heat
- (G) stay warm
- (H) stamina
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Let's think first: Balance is the ability to sense and maintain body position. Body position is critical. Balance is critical.... So the answer is [(A)]


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)]


When will an egg become fertilized?
Options:
- (A) After ejaculation
- (B) Fully cooking the oysters
- (C) allow growth
- (D) Earth orbiting the Sun
- (E) in the autumn season
- (F) colder and wetter
- (G) Plant reproduction
- (H) during the day
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Let's think first: Ejaculation occurs when muscle contractions propel sperm from the epididymes. An egg is fertilized by sperm. Eggs are fertilized after ejaculation.... So the answer is [(A)]


What has a nervous system?
Options:
- (A) animals
- (B) tortoises
- (C) crocodiles
- (D) sponges
- (E) elephants
- (F) placozoans
- (G) mesozoans
- (H) insects
--
Let's think first: Most invertebrates have a nervous system. Insects are the most common invertebrates. Insects have a nervous system.... So the answer is [(H)]


What is important in preventing heat loss from the body?
Options:
- (A) hydration
- (B) a cuticle
- (C) stay warm
- (D) sweating
- (E) warmth
- (F) skin
- (G) keratin
- (H) Animal fur
--
Let's think first: Head hair is especially important in preventing heat loss from the body. Hair is actually composed of a protein called keratin. Keratin is especially important in preventing heat loss from the body.... So the answer is [(G)]


Viruses first infect, then they release into the host by doing what?
Options:
- (A) Cooking
- (B) kill them
- (C) harm them
- (D) lysing
- (E) illness
- (F) fever
- (G) migrate
- (H) propagate
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Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Let's think first: Viruses infect and live inside the cells of living organisms. If the virus is nonenveloped it is released by lysing the host cell. Infection by viruses leads to lysing and release.... So the answer is [(D)]