Question

perception of depth
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Answer 1

Metamorphosis is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation.

Answer 2

Depth perception is the ability to see things in three dimensions (including length, width and depth), and to judge how far away an object is. For accurate depth perception, you generally need to have binocular (two-eyed) vision