Lately you've noticed that you get better test grades some weeks than other weeks. If you guess that when you get more sleep, your grades are higher, which step in the scientific
method of thinking have you used?

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explanation:

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. so they expose rocks