单项选择题

How do all food chains break

A．One kind of animals is eaten up.
B．One kind of plants is destroyed.
C．One kind of animals eats another.
D．One of the links is destroyed.

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单项选择题

Which living things can use sun energy directly

A．Animals.
B．Plants.
C．Both animals and plants.
D．All living things.

单项选择题

How does everything living on earth live

A．Each plant can live alone.
B．Each animal can live alone.
C．Everything living on earth cannot live without needing other living things.
D．If living things want to live they must kill each other.

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