A) digestive system only
B) respiratory system only
C) nervous system only
D) both nervous and endocrine system
Correct Answer: D
Solution :
Animals have two systems of co-ordination i.e., nervous system and endocrine system. Neurones are the basic structural and functional units of the nervous system which spread throughout the organism forming a complex communication network. Endocrine system release hormones for intercellular communication.
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