Question

Which of the following is true about the origin of birds?

Answers:	Bird fossils from the late cretaceous period show a loss of dinosaur characteristics.
	Feathers were first adapted for insulation and coevolved with endothermy.
	Archaeopteryx is an important "intermediate" between a dinosaur and a bird.
	They belonged to a group of bipedal dinosaurs called theropods.

Answer 1

all given options are true

1st. in the late cretaceous period dinosaurs were extinct and there was a rise of modern birds which were different from flying reptile-like birds of the Jurassic period

2nd Most important and earliest significance of feathers was providing insulation. that helped in preventing heat loss, protection from water, keeping body light, and dry, providing heat to eggs.

3rd archaeopteryx is considered as link(missing link) between reptiles and birds.reptile-like characters were nonpneumatic bones, reptilian plan of hands, jaws with teeth, free caudal vertebrae. avian characters of fossil are presence of wings and feathers, hindlimb plan avian type, and jaws modified into beak.

4th theropods are the closest reptilian relative of birds share a lot of common features like presence of pneumatic bones presence of feathers care of eggs bird-like respiration small body size etc.