Compare and contrast the following cycles: Water cycle
Carbon Cycle
3 Unique Characteristics
3 Similarities
3 Unique Characteristics
1.
1.
2.
3.
1.
2.
3.
2.
3.

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:

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.