Closely related,morphologically similar sympatric populations,but reproductively isolated,are designated as

Which of the following statements is correct regarding the history of life on Earth?

First dinosaurs and first egg-laying mammals originated in which period?

The Jurassic period of the Mesozoic era is characterized by:

Which animals have evolved from reptiles?

Assertion : Human ancestors never used their tails and so the tail expressing gene has disappeared in them.
Reason : Lamarck's theory of evolution is popularly called theory of continuity of germ plasm.