SMOG is a combination of
During the past century, the temperature of Earth has increased by ________.
Major portion of the earth's crust is mainly constituted by
A fresh egg when placed in salt water will
Which of the following is the uppermost layer of the atmosphere?
Ficus benghalensis is the scientific name of _______.
In the biosphere living beings are inter-related and interdependent on each other for survival. This life supporting system is known as the __________.
The association of animals in which both the partners are benefitted is known as
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