Because Earth is a closed systems ne energy from the sun enters,
no matter enters or leaves, except sunlight
energy from the sun enters, but is reflected back into space,
changes to one area do not affect any other areas,

it will increase due to the time span

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:

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.

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