science 👍

_____________ formation leads to the tooth decay.

The water comes back on earth as

• rain

• stones

• snow

• hail

Hardest part of the tooth._______________

Teeth begins to appear at the age of

• two months

• two years

• six months

• six years

An adult has _______ teeth

• 38

• 22

• 30

• 32

Which teeth will help you to bite an apple?

• canines

• incisors

• premolars

• molars

Flowing rainwater also takes the ____ layer of the soil away.

• top

• bottom

• middle

• crust

The number of molars in each jaw is

• two

• four

• five

• six

Living things need non-living things like food, water, air to survive on Earth. But the human activities have been largely responsible for increased pollution of all natural resources like water, air, weather etc. Can you mention a few types of pollution caused by human beings?

• Air pollution

• Water pollution

• Land pollution

• All of option 1, 2, 3

This is the largest living animal on Earth.

• Elelphant

• Blue Whale

• Humans

• None of the above