Answer:
The blood brain barrier blocks chemicals from entering brain tissue.
Explanation:
<span>The distinct evidence of climate change in the O’Higgins glacier is proven by the measurement of the area that it covers. About 11.5 kilometers of glacier land has melted within the twentieth century. Satellite images reveal the retreat of glaciers where they compared early 1900s images from the present.
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Answer:
gene pool or gene frequency
Explanation:
Biological Evolution has to do with how a population's gene pool changes over time.
No idea about the scientific reasoning, but the leaves of the plant are where the most photosynthesizing has to happen. In order for the plant to get energy it has to absorb the most light. So it creates broad leaves. The reason they are green is because chloroplasts are green. I believe that the cells in the leaves have more chloroplasts so that they can catch more sunlight.<span />
