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An ecological system is a:
Algae belongs to which of the following levels of the ecosystem?
Which of the following is the most abundant metal on Earth’s crust?
Atoll is a kind of:
How much of the Earth’s land surface is desert?
Pyramid of numbers in an aquatic ecosystem is .
The salt concentration (measured as salinity in parts per thousand), is less than % in inland waters.
The natural gaps across the mountains which provide routes are called:
5. The light from the Sun reaches the Earth in about—
Dumping of solid waste in low-lying areas earth cover is called as: