Ways Earth Supports Life

Which of the following places is life is known to exist?

• only on Earth

• Earth and a few moons around the outer planets

• only Earth and Mars

• Earth and a few exoplanets in other solar systems

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___ is the original source of all energy in food here on Earth.

• the Sun

• the ocean

• the Milky Way Galaxy

• Earth's hot core

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All living things on Earth need ___ to survive.

• all of these

• liquid water

• oxygen from air

• energy from food

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___ allows the energy in sunlight to be STORED in food and used by all living things.

• photosynthesis

• cellular respiration

• germination

• transpiration

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Most scientists think that ___ is the most important substance needed to support life here on Earth - and probably life elsewhere.

• liquid water

• oxygen

• glucose

• carbon dioxide

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Liquid water is special and helpful to living things because it can ___.

• dissolve stuff (break stuff into smaller pieces)

• flow and move stuff into and out of cells

• pass through the cell membrane in cells

• all of these

Question 7

Our Sun is a ___ star that will "survive" for billions of years.

• yellow dwarf

• blue giant

• red dwarf

• brown dwarf

___ is a word that means able to support life.

• habitable

• uninhabitable

• habitat

• habit

The ___ is the distance from a star where it is the right temperature for liquid water to exist on the surface.

• habitable zone

• planetaty zone

• water zone

• life zone

The ___ zone is a nickname for a star's habitable zone.

• Goldilocks

• Cinderella

• Red Riding Hood

• Snow White