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What are the causes of soil compaction? (Site 1)

Soil compaction occurs when soil particles are pressed together, reducing pore space between them. Heavily compacted soils contain few large pores, less total pore volume, and consequently, a greater density. A compacted soil has a reduced rate of both water infiltration and drainage.

Explanation:

You might need to change some words, dunno I found it on google. Also needed the answer tho

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:

it would be heredity