The study of heredity and variation in living organisms is called:

Which of these is not a renewable source of energy?

Which gas is used in the preparation of soft drinks to add fizz?

The chemical formula for common table salt is:

The unit used to measure electric current is:

The energy released when a substance burns in the presence of oxygen is called:

Which of the following diseases is caused by a virus?

The hardest natural substance found on Earth is:

The main function of red blood cells is to:

Sound cannot travel through:

The layer of the atmosphere where weather phenomena occur is called: