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Being Alive

Across
The leftover matter a cell or body does not need after it uses food for energy
Any living thing
The way organisms make more of their own kind
To use again
Something too small to be seen with the naked eye
To act according to conditions in the environment
Down
The substances in food that organisms need for energy
A device for viewing objects that are too small to be seen with the naked eye
The ability to work
The tiny basic units of which all living things are made
To break down into smaller pieces