Bryant compared six different kinds of fertilizer. he grew fourteen plants from cuttings of one plant to make sure they would all be the same. he gave each plant the same amount of water and sunlight each day. he also gave each plant a small amount of fertilizer every week. two plants got each kind of fertilizer. two plants got no fertilizer. in this experiment, the kind of plant was a variable that was

cramming before a final is bad because it makes a student's stress level higher. students who embrace cramming to get through a final exam week find themselves struggling to perform consistently, once the brain adjusts to prolonged sleep deprivation.

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answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

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pesticide