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Which of the following statements are correct?

1. As a part of the Constitution, preamble can be amended under Article 368 of the Constitution, but the basic structure of the preamble can not be amended.
2. As of now, the preamble is only amended once through the 42nd Amendment Act, 1976.

Dead fish floating on Ashtamudi Lake recently. According to a preliminary report, the mass mortality event was caused by an algal bloom, a phenomenon that occurs due to 

Which of the following pairs are correct?

1. Ranthambore Tiger reserve          -           Jharkhand
2. Bhandavgarh Tiger reserve          -           Madhya Pradesh
3. Similipal Tier reserve                   -           Odisha

Which of the following statements are correct?

1. India’s import dependence on coking coal is about 85%
2. India’s import of coking coal is much higher than that of the European Union’s.