Secretion of which hormones in too little quantity than required causes diabetes?
Insulin.
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Mention the receptors for light and sound in animals.
Animals receive a variety of external information through specialized structures called sense organs or receptors. These are: (i) Photoreceptors: They receive light. (ii) Phonoreceptors: They receive sound.
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Name multicellular organisms in which coordination is achieved only by means of chemicals.
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