How has new technology related to hydroelectricity become more environmentally friendly in recent years? a- Increased precipitation prevents aquifers from running dry.
b-Waste is contained in a reservoir, preventing contamination of rivers and streams.
c- Diversions force water into a canal, providing new habitats for aquatic dwelling organisms.
d-Adverse impacts on fish and their habitats have been reduced with the introduction of fish ladders.

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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on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.