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Bio/Chron crossword

Across
Cause to occur or operate at the same time or rate.
A risk yo human health and the environment .
An instrument for measuring time.
An account of someone's life written by another person.
Capable of being decomposed by living organisms.
A medicine that helps people get healthy.
The study of living organisms.
Down
Factual written account of important or historical events in order.
Factual written account of important or historical events in order.
Persisting for a long time or constantly recurring.