tick the correct satement . signaling molecules a) are  found exclusively in animals b) allow cells to communicate with only non- living environment c) are always d) are produced by specific cells and received by target cells

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Please find below the solution to the asked query

Signaling molecules are found in both plants and animals. These molecules are produced by specific cells and are received by the target cells on which they act. 
Hence, the correct option is (d).

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