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Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that

Some dinosaurs had feathers although they could not fly using the feathers. Birds also have feathers to flight. Since, dinosaurs were reptiles, this means that birds are evolved from reptiles.

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23

The number of pair (s) of sex chromosomes in the zygote of humans is

 24

The theory of evolution of species by natural selection was given by

 1

How is the sex of a newborn determined in humans?

 2

Does genetic combination of mothers play a significant role in determining the sex of a new born?