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What are two vestigial structures?

Answer 1

The male nipple and the covered over eyes of the blind fish of death valley.

According to the Darwinian theory of evolution, the evolution of one life form into another can be explained by descent with modification.

The human body is supposed to contain a number of vestigial structures, according to Darwinian evolution theory. In 1960, over 100 structures were considered to be vestigial; today, all of these structures—apart from the male nipple—are no longer considered to be so.

The eye socket of a blind fish is considered a vestigial organ because it no longer serves an adaptive function or purpose. The blind fish of Death Valley are found in underground lakes and streams where there is no light at all. These fish have lost their ability to see. However, their eye socket remains a part of their body.

The human appendix is a vestige organ as well.

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Answer 2

Daniel Allen

Appendix
Coccyx (tailbone)

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.