51. Zoos are examples for
52. Red sea is an example of a ________ structure.
53. Which of the following is not an indicative biological trait for the trait of ecology?
54. When is the World Wildlife week ?
55. Green revolution is associated with _________
56. ________ is the natural phenomenon, caused by an unlimited and unprecedented rainfall.
57. _________ is an important factor that aggravates the effect of drought.
58. Which statement(s) below is/are correct?
59. Which of the following statements is/are correct?
60. The pioneers in xerach succession is the
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