Question

A bird with teeth is
A) Kiwi
B) Ostrich
C) Dodo
D) Archaeopteryx

Answer 1

Hint: Birds are called as avian where they have special adaptation compared to other classes because they have unique ability to flight, first formed birds have so many characteristics that are related to reptiles but later as time goes on so many variations happened and modern birds lost so many features of early or first formed birds.

Complete answer:
Early formed birds comes under one genus, where they are called as Archaeopteryx where this name is derived from the German, and that is a German word and it means it is the first bird, and this Archaeopteryx was accepted by all paleontologist, at this are old birds.
Archaeopteryx is generally the size of a raven, and they have broad wings, and the wings are shaped round at the end, they have long tails compared to the length of the body.
These birds can reach up to the length of the body of 500 mm and they also have feathers, which are in a similar structure to the feathers of modern-day birds.
Archaeopteryx had three separate digits on each of their legs, and each of them ending with a claw, where some birds have those features such as ducks, swans, etc. Even though this Archaeopteryx has the features of birds, this also has the characteristic features of the dinosaurs.
Generally, birds do not have teeth, but the Archaeopteryx had teeth-like structures that are small in size, and they also have a long bony tail, where they exist in dinosaurs. So this genus of first birds has the features of both modern birds and the non avian dinosaurs, so they are considered as a link between them.
So this Archaeopteryx is referred to as a genus of birds that are like dinosaurs and considered as a transition between the non-avian feathered dinosaurs and modern birds.

So, the correct option is D

Note: Archaeopteryx is the genus of the first formed birds, where this has some of the features of birds such as feathers and some of them have reptile features such as having tailbone-like dianousers, so this is considered a connecting link between the reptile and birds.