What techniques do scientists use to study ocean sediments

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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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: