Identify the dinosaur shown in the figure.

The number and kinds of organisms are not constant. How do you explain this statement?

Choose the correct statement from the following:
$A$. Charles Darwin travelled around the world in a ship called $HMS$ Beagle
$B$. There has been gradual evolution of life forms
$C$. According to Darwin,fitness refers to physical fitness only
$D$. Fossils are remains of hard parts of life forms found in rocks
$E$. Hugo De Vries,a naturalist worked in Malay Archipelago.

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

The Permian period,during which the first most modern orders of insects appeared,occurred approximately

$A$ species that is produced by the loss or disappearance of a few characters found in its parents is termed as: