Q: The Moon is visible to observers on Earth because of OPTIONS:
- reflected sunlight
- absorbed light from Earth's atmosphere
- gases in the Moon's interior
- volcanic eruptions on the Moon's surface
A: reflected sunlight

Mosquitoes have adapted to detect carbon dioxide using certain sensory nerves. Mosquitoes instinctually move toward greater concentrations of carbon dioxide. What is the importance of this adaptation?
OPTIONS:
- It helps mosquitoes find food.
- It helps mosquitoes find mates.
- It helps mosquitoes find clean air.
- It helps mosquitoes find shelter.

It helps mosquitoes find food.

Q: Which characteristic is found ONLY in mammals? ---- OPTIONS:
- eyes that detect color
- glands that make milk
- skin that absorbs oxygen
- bodies that are protected by scales

A: glands that make milk

Which of the following is a central role of carbon in the chemistry of living organisms?
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OPTIONS:
- Carbon can only bond with other carbon atoms.
- Carbon is a solvent that breaks chemical bonds.
- Carbon readily forms ionic bonds that separate easily.
- Carbon can form many types of molecules with covalent bonds.

Carbon can form many types of molecules with covalent bonds.

Question:
Earth rotates on its north-south axis. Which statement best describes one complete rotation?
OPTIONS:
- It takes six months and causes summer and winter seasons.
- It takes 24 hours and causes night and day.
- It takes 29 days, which represents one cycle of the Moon's phases.
- It takes 365 days, which represents one Earth year.
Answer:
It takes 24 hours and causes night and day.

[Q]: Which group of organisms can show significant trait changes in the shortest period of time?
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OPTIONS:
- bacteria
- birds
- fish
- reptiles
****
[A]:
bacteria