One of the following factors does not lead to soil formation in nature
The two forms of oxygen found in the atmosphere are
One of the following processes is not a step involved in the water-cycle operating in nature
Which of the following is not a greenhouse gas?
The cell wall of which one of these is not made up of cellulose?
The basic unit of life is:
Which of the following is not a criterion for classification of living organisms?
Amphibians do not have the following
Which is not an aquatic animal?