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Science Final

Across
A long period of dry weather
A tiny thing that may cause disease
A gas in the air that plants use to make food (2 words)
An organism that captures and eats other animals
An illness
A structure or behavior that helps an organism survive
Down
Anything harmful added to the air, water, or land
A group of body parts that work together to perform a job
The hardened parts left by an organism that lived long ago
When very few organisms exist and someday might not be found on Earth
A nonliving material that can be found in soil
A developing animal before it is born or hatched