Which of the following is not a structural adaptation?
A Forelimbs of penguin are modified into flippers for
swimming.
B Fennec fox has large ears to help it lose excessive
body heat which enables it to inhabit hot xeric habitats.
C Palatable viceroy butterfly mimics unpalatable
monarch butterfly to elude its predators.
D Cane toad and hedgehog aestivate to escape harsh
summers.