Which occurrences do the greenhouse effect contribute to? Choose exactly 3 answers that are correct.
O strange weather patterns
O higher ocean water levels
O global warming
O greater fossil fuel burning
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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:

age range would be the answer