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Question 1

whats invertebrates?

Answer 1

animals without backbones, aquatic invertebrates are animals without back bones in water

Question 2

whats ppm?

Answer 2

parts per million, it is the number of parts of a dissolved substance in one million parts pf total solution.

Question 3

whats LD50?

Answer 3

the amount of substance that causes 50% of a group of test animals to die from ingestion of dosage

Question 4

what are two situations that reduce dissolved oxygen content of water?

Answer 4

high temperatures, and fewer plants to do photosynthesis to produce oxygen.