A) hormones
B) melanocytes
C) nervous system
D) Both [a] and [c]
Correct Answer: D
Solution :
Basically frogs have three types of pigmentations (melanophore, iridophore and xanthophores). These chromatophores are controlled by the forges central nervous system and hormones. When needed frog could put these pigments into use. They could produce a wide variety of shades from brown to grey, green, etc.
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