A researcher discovered a new hormone in the human body that decreases blood potassium levels. According to the principles of
negative feedback when would this hormone be released into
the body?

the answer would be knowledge about cars!

and after water is usually warmed by the sun the water temperature raises and then evaporates .

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.