Blood is the tissue out of the following.
Blood brings oxygen, nutrients, hormones, and a couple of more molecules as well as eliminating the wastes. This is a reason of why it is a tissue. Moreover, other connective tissues have the same origin as blood does which is a second reason of why blood is considered a tissue.
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Answer: When the plant has enough water in its cells the guard cells swell up and open the stomata. When the plant isn't getting enough water the guard cells can't swell and the stomata stay closed, so the plant doen's lose water. But if the stomata are closed photosynthesis can't happen and eventually the plant might starve.
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