Question Select the correct answer.
Which statement describes a causal relationship between two variables?
o In years with more rainfall, the level of the lake increases,
Countries with more televisions per person generally have more cars per person,
O Fires lead to more expensive property damage in neighborhoods with higher numbers of firetrucks,
o Children who are taller tend to have larger vocabularies,
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The existence of correlation implies no causal relationship: the two could be causally related to a third variable. For example, my age is correlated with the number of TV sets in the UK but obviously there is no causal link between them - they are both linked to time.

Explanation:

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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