How does an organism's structure affect it's ability to survive?

factors can also affect an organism's ability to survive in an ecosystem. They include food availability, competition with other organisms,

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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.

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