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Which of the following organisms fix nitrogen in aquatic ecosystems?
Which one of the following ecosystems covers the largest area of the earth's surface?
Which of the following ecosystems covers the largest area of the earth's surface ?
The energy in most ecosystems comes from
When the two ecosystems overlap each other, the area is called
What environmental issue involves the excessive use of fertilizers and run-off chemimls into bodies of water. causing oxygen depletion and harm to aquatic ecosystems?
Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has
Through nitrogen fixation process nitrogen in the atmosphere is converted into
A person can travel from Dhaka to Faridpur in 5 different ways and then come back in any of these ways. How many different routes are possible for him to go to Faridpur and come back?
Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one