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An ecological system is a:
Uneven distribution of insolation on the earth is mainly due to the:
Which of the following metals contribute to bio magnification problem in the ecosystem?
Which type of lake is formed by volcanic activities?
What causes day and night cycle on Earth?
A place where there is constant intermingling of salt water and fresh water is
The highest grade and best quality coal is:
The atmospheric layer farthest from the Earth’s surface is known as:
Density of the earth’s atmosphere is highest in the:
In sea, plants are restricted up to the depth of: