The ancestors of modern day frogs and salamanders are:

In the embryos of all vertebrates,including humans,a row of vestigial gill slits appears behind the head,but they function only in fish and not in other adult vertebrates. This observation was challenged by which scientist?

Which of the following statements is not true?

Which type of evolution is shown by tendrils of Cucurbita and thorns of Bougainvillea?

Did aquatic life forms get fossilised? If yes,where do we come across such fossils?

The flippers of a Penguin and a Dolphin show $:-$