Question

why is there any specie of dinosaurs did not remain after the astroid hit???

Answer 1

There are various theories about how Dinosaurs got extinct:

# Dinosaur got extinct due to a large asteroid blast on earth,and all species of dinosaurs died.

# Dinosaurs failed to evolve to survive the changing climatic condition.

# Most of the dinosaurs evolved to birds,as we see today.

These factors affected the complete extinction of dinosaurs. :(

The  reason for the extinction of Dinosaurs is a mixture of all these theory,No one knows the real reason though.