Answer:
The highest population an environment can support.
Probably the animals and what the animals live in.
Law would be the correct answer to fill in the blank. Law is correct because scientific law explains behaviors of natural phenomenons since it's based on repeated experiments.
Preformed water (ingested in food and drink) and metabolic water (by product of aerobic respiration and dehydration synthesis)
They most likely uses a sample and a microscope to see.
