What do bacteria not have, for protein production?
Options:
- (A) Acids
- (B) alleles
- (C) ribosomes
- (D) layers of fat
- (E) light energy
- (F) heat energy
- (G) Energy
- (H) Energy.
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Let's think first: Ribosomes are small organelles where proteins are made. Bacteria contain no organelles. Bacteria do not have ribosomes for protein production.... So the answer is [(C)]

What occurs in animals as they respond to changes in their habitat?
Options:
- (A) starvation
- (B) evolution
- (C) arousal
- (D) relocation
- (E) resistance
- (F) dependency
- (G) Leptospirosis
- (H) Movement
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Let's think first: Evolution occurs in response to a change in the environment. Animals react instinctively to changes in their environment. Evolution occurs in animals as they respond to change in their habitat.... So the answer is [(B)]

The two-chambered heart of some backboned aquatic animals is part of their:
Options:
- (A) aerobic capacity
- (B) three-chambered heart
- (C) biological diversity
- (D) it keeps an organism warm
- (E) the body's largest organ
- (F) circulatory system
- (G) salmon
- (H) swimming system
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Let's think first: Fish have a circulatory system with a two-chambered heart. Fish are backboned aquatic animals. Some backboned aquatic animals have a circulatory system with a two-chambered heart.... So the answer is [(F)]

What is rain that absorbs into the earth called?
Options:
- (A) aqueous solution
- (B) heat energy
- (C) soilwater
- (D) groundwater
- (E) peachleaf willow
- (F) mud
- (G) puddle
- (H) water vapor
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Let's think first: Some precipitation that falls on land may soak into the ground, becoming groundwater. Rain is also known as precipitation. Rain that falls on land may soak into the ground and become groundwater.... So the answer is [(D)]

What have varied life cycles?
Options:
- (A) bacteria
- (B) fungi
- (C) Variety.
- (D) Cycles.
- (E) plants
- (F) Plants.
- (G) insects
- (H) Life of air.
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Let's think first: Algae have varied life cycles. Some, such as the green algae, are plants. Some plants have varied life cycles.... So the answer is [(F)]

Some touch receptors sense a difference in pain or what?
Options:
- (A) heat
- (B) cold
- (C) skin
- (D) nerves
- (E) color
- (F) contact
- (G) smell
- (H) motion
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Let's think first: Some touch receptors sense differences in temperature or pain. Heat and temperature are the same. Some touch receptors sense differences in heat or pain.... So the answer is [(A)]