LIFE SCIENCE

Detailed explanation-1: -Pythons and boa constrictors have tiny hind leg bones buried in muscles toward their tail ends. Such features, either useless or poorly suited to performing specific tasks, are described as vestigial.

Detailed explanation-2: -Pelvic spurs are the externally visible portion of the vestigial remnants of legs found on each side of the cloaca in primitive snakes, such as boas and pythons.

Detailed explanation-3: -Common examples of vestigial structures are the hip bones that remain in snakes and whales. At a time, these species had ancestors that had limbs that required hips for mobility.

Detailed explanation-4: -A vestigial structure is a biological structure that has lost a major ancestral function and is usually drastically reduced in size. Well-known examples include the eyes of blind cave fishes and blind cave salamanders, and the diminutive wings of kiwis and emus.

Detailed explanation-5: -Structures that have no apparent function and appear to be residual parts from a past ancestor are called vestigial structures. Examples of vestigial structures include the human appendix, the pelvic bone of a snake, and the wings of flightless birds.