Type the correct answer in the box. Spell all words correctly. Complete the statement with appropriate word.
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hazards arise because workers may carelessly handle tools with blunt ends or sharp edges.

1. in what ways have non-native species been beneficial? 2. what are some of the hypotheses for the collapse of honeybee colonies? 3. distinguish between regional and functional extinction. 4. why is it difficult to measure background extinction rates? 5. what three factors are most important in causing extinction rates to climb?