Ll living things need energy; it is a requirement for life. in a typical cell, atp, the high energy molecule, is produced in the in the presence of a sugar (glucose) and a) nucleus; oxygen eliminate b) er; carbon dioxide. c) mitochondria; oxygen. d) vacuole; water vapor.

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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ok yes, but what is the question? as soon as you ask the actual question i will answer it. : )