What does the hardy Weinberg principle relate to? A) chances of survival of an organism
B) frequency of alleles in a population
C) natural selection in a species
D) causes of evolution among organisms

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:

answer; i believe the answer is hydraulic action;

c. the initial amount of money placed in the savings account