What is true of the fossil record of mammalian origins

Asked by maham237 @ 05/06/2021 in Biology viewed by 236 People

what is true of the fossil record of mammalian origins? it includes a series that shows the gradual change of scales into fur. it shows that mammals and birds evolved from the same kind of dinosaur. it indicates that mammals and dinosaurs did not overlap in geologic time. it includes transitional forms with progressively specialized teeth?

Answered by maham237 @ 05/06/2021

It includes transitional forms with progressively specialized teeth.
The key thing to remember about fossils is: If it's not hard, it's rarely preserved. Now let's look at the options and pick the correct one that matches the known facts.
It includes a series that shows the gradual change of scales into fur.
* This option is rather hard to swallow. There have been a few fossils discovered with soft tissue features, but those fossils are extremely rare. Expecting a record of a gradual change of soft tissues is not likely. So this is a bad choice.
It shows that mammals and birds evolved from the same kind of dinosaur.
* The evidence shows that mammals evolved at the end of the Triassic period from therapsids (about 201 to 250 million years ago). Birds are a relative newcomer with Archaeopteryx being approximately 150 million years ago. So this choice is wrong.
It indicates that mammals and dinosaurs did not overlap in geologic time.
* Nope. Mammals existed throughout the Jurassic period that came after the Triassic period where the first mammals were discovered. So this is a bad choice.
It includes transitional forms with progressively specialized teeth.
* Most definitely. Teeth are nice hard structures that are easily fossilized. And this is the correct choice.

Take any three non-collinear points a b c and draw triangle a,b,c. through each vertex of the triangle draw a line parallel to the opposite side using ruler and compass

Asked by wiki @ 15/11/2022 in Mathematics viewed by 1534 persons

What is true of the fossil record of mammalian origins

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