The brain is incorrect. Its the nucleus (the brain is an organ not a organelle)
hope that helps :)
Their is AB, O, B, and A. Which is four. If your were to include whether the blood type was a Negative blood type and positive blood type they're would be . AB+, O+, B+, A+, AB-, O-, B-, A-. Which is eight.
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If the activity of osteclasts(which demineralize bone) exceeded osteoblast activity(production of new bone), then the bone's mineral content(and thus its mass) would decline, making it weaker.
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It can go to waste because people think since it's renewable and they don't have to worry about running out of that certain rescourse that they can use it for purposes it was not intended for.
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