While studying the embryos of deer and hens, Bryan found marked similarities in them. Even though deer and hens are very different as adults, their embryos are very similar. Which of the following correctly explains this similarity? A.
Deer and hens share an common, early ancestor.
B.
Deer and hens share a common, recent gene pool.
C.
Deer and hens share a common habitat.

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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me and my friend did 2

the answer is 100% density i've answered this question before and done the quiz myself.