D because if the species was to be removed from an ecosystem, everything that needed that species as food, or the species ould have to adapt to the foods available in the new ecosystem they live in. Hope I helped, and let me know if you are still not 100% sure about the answer, and I'll try to clarify what I said.
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I see an apple tree in my yard every day. I know that it is a plant because it has a root, stem, leaves, flowers, and fruit.
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Hope this helps!!!! :D
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By cooling the heart, its need for oxygen is reduced. This allows surgeons to work on the heart for two to four hours without damaging the heart tissue.
95% occurs in the small intestine.
