Article: Worldly words.(VOCABULARY BUILDER)

The front and back of this poster are filled with vocabulary words. Use them to solve the clues below and complete the crossword puzzle. Then, unscramble the letters in the parentheses to spell out the bonus words.

ACROSS

1. Trait that helps a plant or animal survive in its environment --------(-)-

2. A large region where plants and animals live together in a particular climate: -----

3. A layer of frozen earht that is situated beneath the soil: --(-)-------

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