Question

justify that the pancreas and the gonads perform dual function

Answer 1

Pancreas is known for dual. Pancreas and gondas can perform dual functions as through they are bothe endocrine and exocrine gland. So they perform the functions of both and collectively called heterocrine gland.
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Answer 2

Pancreas and Gonads can perform dual functions as through they are both endocrine and exocrine gland. So they perform the functions of both and can be collectively called Heterocrine gland.