We can break a piece of chalk into smaller pieces, but we can not break an iron nail easily. Why ?

We can break the layers of graphite easily - Why ?

How can we draw a food chain?

The type of nutrition we can observe in Amoeba.

Why do we apply paint of iron articles ?

We can see the spots in

We can see this animal in deserts

Where can we can observe breathing or aerial roots ?

What is the name given to certain material which can be break down into smaller fragments in the presence of water, sun light and oxygen and by bacteria?

We can draw ………… tangents to a given circle .