Paraphrasing:
It is the compound of hydrogen and oxygen, it is an essential part of our lives.
Water
It was a flightless bird that became extinct.
The dodo
It is somebody who teach something.
Teacher
This is de country that is the most visit in the world.
France
Is the tool used to write or draw.
Pencil
It is the fastest dog breed in the world.
The greyhound
This is a place where you go to study your college career.
University
This is the mammal that is the largest in the world
The Antarctic blue whale
This is used to drink water.
Glass
It is the only mammalian bird in the world.
Platypus
This is a page that we use when we don't know something.
This is the animal that has three hearts to live.
Octopus
Smart device used for communication.
Cell phone
is a physician who specializes in eye and vision care.
Ophthalmologist
This is an animal that is the enemy of the dog.
Cat
This is someone who invented the atomic bomb
Robert Oppenheimer
It is a luminous object that uses electricity for its operation.
Lamp
It is the ancient construction considered the sixth wonder of the world.
The Great wall of Chine
This is the dog that is the smallest in the world.
Chihuahua
This is someone who invented the first computer.
Charles babbage