_ are an essential nutrient for animals.
Options:
- (A) Energy
- (B) Chemicals
- (C) trees
- (D) potatoes
- (E) Acids
- (F) allow growth
- (G) store
- (H) Proteins
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Let's think first: All animals are heterotrophs. Proteins are an essential nutrient for heterotrophs . Proteins are an essential nutrient for animals.... So the answer is [(H)]

What are not cells at all, so they are neither prokaryotes nor eukaryotes?
Options:
- (A) Something with a head, thorax, and abdomen
- (B) Microscopic organisms
- (C) The smallest agent of disease
- (D) Dead prehistoric beings
- (E) female sex cells
- (F) major threat to health
- (G) remains of prehistoric life
- (H) Something that smells like rotten eggs
--
Let's think first: Viruses are not cells at all, so they are neither prokaryotes nor eukaryotes. Viruses Viruses are the smallest agents of disease. The smallest agents of disease are not cells at all, so they are neither prokaryotes nor eukaryotes.... So the answer is [(C)]

Where is the name of a habitat where a variety of ocean organisms often seek food and shelter?
Options:
- (A) gastropod shells
- (B) body water
- (C) seaweed
- (D) more abundant
- (E) whale
- (F) coastlines
- (G) algae
- (H) patch reefs
--
Let's think first: Coral reefs provide food and shelter to many ocean organisms. Coral reefs occur mainly as numerous patch reefs. Patch reef provide food and shelter to many ocean organisms.... So the answer is [(H)]

What is needed for changes to occur?
Options:
- (A) exercise
- (B) mutations
- (C) growth
- (D) healthy animals
- (E) environment
- (F) evaporation
- (G) Exfoliation
- (H) births
--
Let's think first: Mutations are essential for evolution to occur. Evolution Change through time. Mutations are essential for changes to occur.... So the answer is [(B)]

Some viruses can what?
Options:
- (A) fret
- (B) harm
- (C) damage
- (D) grow
- (E) expand
- (F) discover
- (G) visit
- (H) kill
--
Let's think first: Some viruses can cause cancer. Skin cancer can kill. Some viruses can kill.... So the answer is [(H)]

What stimulates the reproductive system to form male organs in growth?
Options:
- (A) Chemical energy
- (B) barnacles
- (C) Electrical energy
- (D) a doorbell
- (E) sensory neurons
- (F) peachleaf willow
- (G) Veins and arteries.
- (H) male hormones
--
Let's think first: Testosterone stimulates the reproductive organs to develop into male organs. Androgens are male hormones, like testosterone. Male hormones stimulated the reproductive organs to develop into male organs.... So the answer is [(H)]