Chemical co-ordination in the body is brought out by

A. Blood

B. Lymph

C. Enzymes

D. Hormones

Answer: Option D

Solution(By Examveda Team)

In vertebrates the chemical coordination is brought about by endocrine glands which secrete hormones.

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C. decrease in thickness of ozone layer in stratosphere

D. increase in the thickness of ozone layer in troposphere