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plant-like organisms that live and grow in water; they make their own organic food by the process of photosynthesis.
a hormone produced by the adrenal glands which helps to maintain the balance of sodium in the...
tough connective tissue found in conjunction with muscle, cartilage and bone.
(also called the pith) the central part of the stem that consists of large, thin-walled...
an alkaline watery fluid containing digestive enzymes, which is secreted into the mouth by...