Scientists question whether animals understand the meaning of the signals they give and receive in the study of animal

The answer is animal communication. This is the transfer of information from a single or group of animals to other animals that will have an effect on the behaviour of the animals. Types of information include courtship displays, warning off others when defending territory and signalling the presence of a food source. .Animal communication is studied in many different disciplines including animal behaviour, sociobiology, neurobiology and animal cognition.

I’d say a : water molecules