81.
Animal species should be protected because they are

82.
Natural water that exposed to limestone is

83.
Biotic factors are

84.
Soil particle determine its

85.
The most important cause for the loss of biodiversity is

86.
Kanha National Park is located in

87.
Sudden mass death of fish is more likely to occus in

88.
Which of the following will help most in biosphere is the conservation of wildlife?

89.
Soil erosion can be prevented by

90.
The common source of energy in our villages is

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