How can animals with six legs detect sound?
Options:
- (A) thorax
- (B) Refract it
- (C) electricity
- (D) they bend
- (E) wings
- (F) environment
- (G) pupils
- (H) antennae
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Let's think first: Some insects can use their antennae to detect sound. Every insect has six legs, that's an insect. Animals with six legs can use their antennae to detect sound.... So the answer is [(H)]

Invertebrates can be what?
Options:
- (A) people
- (B) scarce resources
- (C) vertebrates
- (D) deposit feeders
- (E) Catch prey
- (F) major threat to health
- (G) more abundant
- (H) planets
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Let's think first: Earthworms are important deposit feeders that help form and enrich soil. Earthworms by Casey Earthworms are invertebrates. Invertebrates can be deposit feeders.... So the answer is [(D)]

Amphibians with what are more advanced than fish?
Options:
- (A) four eyes
- (B) sensory neurons
- (C) rapid expansion
- (D) layers of fat
- (E) four limbs
- (F) kinetic energy
- (G) tails
- (H) many limbs
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Let's think first: Amphibians are the first true tetrapods, or vertebrates with four limbs. All vertebrates more advanced than fish have four limbs, each with up to five fingers or toes. Amphibians with four limbs are more advanced than fish.... So the answer is [(E)]

P16 is an example of what type of thing that causes cancer when it stops functiong properly?
Options:
- (A) Toxins
- (B) edema
- (C) gene
- (D) ferns
- (E) CO 2
- (F) PDAs
- (G) HIV
- (H) albino
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Let's think first: Cancer is a disease that occurs when the cell cycle is no longer regulated. P16 is a regulator of the cell division cycle. Cancer is a disease that occurs when genes like P16 stop functioning properly.... So the answer is [(C)]

Marine biomes are found in large bodies of what?
Options:
- (A) fresh water
- (B) the environment
- (C) salt water
- (D) liquid
- (E) river water
- (F) Absorb light
- (G) Sediment
- (H) black water
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Let's think first: Marine biomes are found in the salt water of the ocean. An ocean is a large body of salt water. Marine biomes are found in large bodies of salt water.... So the answer is [(C)]

Where do platypus females construct their homes for egg laying?
Options:
- (A) loose dirt
- (B) out in the open
- (C) loose soil
- (D) Summer
- (E) rocky areas
- (F) autumn
- (G) soft soil
- (H) compacted soil
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Let's think first: Platypus females lay their eggs in a burrow. Burrows are constructed in soft soil. Platypus females lay their eggs in homes constructed in soft soil.... So the answer is [(G)]