What can a certain protein affect in meat?
Options:
- (A) health
- (B) piousness
- (C) stamina
- (D) retina
- (E) toughness
- (F) liveliness
- (G) saltiness
- (H) Energy
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Let's think first: Cartilage is a tough tissue that contains a protein called collagen. Collagen contributes to meat toughness. A protein contributes to meat toughness.... So the answer is [(E)]

What is a waste product of the body that is excreted by the urinary system?
Options:
- (A) potash
- (B) food
- (C) CO 2
- (D) sugar
- (E) urea
- (F) liquid
- (G) H 2 O
- (H) sulfur
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Let's think first: Urine is the liquid waste product of the body that is excreted by the urinary system. Mammals excrete urea in the watery form of urine . Urea is a waste product of the body that is excreted by the urinary system.... So the answer is [(E)]

Something more complex in eukaryotes than prokaryotes leads to what?
Options:
- (A) harm them
- (B) sweating
- (C) Growth
- (D) illness
- (E) fever
- (F) parasites
- (G) death
- (H) recycling
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Let's think first: Cell division is more complex in eukaryotes than prokaryotes. Cell division leads to the growth of cells in the population. Something that leads to growth is more complex in eukaryotes than prokaryotes.... So the answer is [(C)]

Bees and other insects are attracted on purpose by what?
Options:
- (A) colors
- (B) orchids
- (C) human food
- (D) chemicals
- (E) flowers
- (F) humans
- (G) pollen
- (H) perfume
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Let's think first: Flowers attract animal pollinators. Insects are the most common animal pollinators, and bees are the most common insect pollinators. Flowers attract bees and other insects.... So the answer is [(E)]

_ is more complex in eukaryotes than prokaryotes.
Options:
- (A) voltage
- (B) disease
- (C) Epidermis
- (D) Mitosis
- (E) organ
- (F) distance
- (G) recycling
- (H) resistance
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Let's think first: Cell division is more complex in eukaryotes than prokaryotes. Mitosis is cell division. Mitosis is more complex in eukaryotes than prokaryotes.... So the answer is [(D)]

What are important biomes?
Options:
- (A) important habitats
- (B) fruits, vegetables and plants
- (C) retaining heat
- (D) stars, comets and planets
- (E) cats, dogs and humans
- (F) absorb light energy
- (G) marshes, bogs, and swamps
- (H) remains of prehistoric life
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Let's think first: Wetlands are extremely important biomes. Palustrine wetlands include marshes, bogs, and swamps. Marshes, bogs and swamps are very important biomes.... So the answer is [(G)]