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Science: Week #22 Crossword Puzzle

Across
Hermit crabs are an example
The sugar plants make in photosynthesis
A relationship between two organisms of different species where one or both species benefit
Are people who live alone
Exoskeletons are mostly made from this
Down
Hard out body covering that some creatures have for protection
A scientist who studies crustaceans
Are animals that eat whatever they can find, and often they are dead
When a creature sheds a shell in order to grow
Belly or stomach