Answer: the correct option is : highly developed cell- cell communication.
Explanation: In complex multicellular organisms, cell - cell communication also known as cell signalling is part of any communication process that leads basic activities of cells and coordinates multiple cell functions.
The correct answer is D.) The sun
The sun’s heat causes liquids to evaporate into water vapor, which rises and forms clouds. The whole water cycle repeats itself again because of the sun.
The answer to number 2 would be as the number of carbon carbon 2ble 2ble bonds increase, the melting point decreases
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