_____ should be produced on a large scale.

Examples of thermoplastics are:

Where was coal gas used FIRST for street lighting and when?

Nuclear is separated from cytoplasm by a membrane called:

We must put a sharp or a pointed thing in our ears.

Manure cannot be prepared in the fields.

Paper can be biodegradable within 10 to 30 days.

A Tough ,Porous and black substance obtained by coal is called

A human body has ______ of cells.

What is the symbol of hertz and decibel