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How many types of ecological pyramids are present in ecosystem?
Identify correct type of food chain. Grass – Rabbit – Fox:
Which is the warmest layer of the atmosphere?
Which of the following is NOT man made ecosystem?
Extensive deserts occur in the western tropical regions of continents because:
Smog is a combination of:
Tundra’s are:
What is an isthmus?
Which of the following Scientist proved that the path of each planet around the Sun is elliptical?
Taiga means: