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Comprehensive and Detailed Explanation (150–250 words):

The passage lists reforestation, sustainable agriculture, and policies. It does not mention renewable energy. Thus, D is correct.

Comprehensive and Detailed Explanation (150–250 words):

Rearrange: 1/x=1/4−1/6=(3−2)/12=1/121/x = 1/4 - 1/6 = (3 - 2)/12 = 1/12. Thus x=12x = 12. However, check carefully: equation given is 1/x+1/6=1/41/x + 1/6 = 1/4. So 1/x=1/4−1/6=1/121/x = 1/4 - 1/6 = 1/12. Therefore x=12x = 12. Answer is A (12). The common trap is sign errors. Negative solutions don’t apply here because the fraction differences are positive.

Comprehensive and Detailed Explanation (150–250 words):

The passage presents pros and cons: space telescopes offer clarity without atmospheric distortion, but costs and maintenance are drawbacks. Ground observatories, enhanced with adaptive optics, remain important. The conclusion is that both are indispensable, not mutually exclusive. Option A oversimplifies and contradicts. Option B ignores the statement that ground observatories are indispensable. Option D suggests abandoning adaptive optics, while the passage endorses them. The best conclusion is C—a balanced recognition of both technologies’ complementary roles.

Comprehensive and Detailed Explanation (150–250 words):

Multiply coefficients: 2×3=62 \times 3 = 6. For exponents: x3⋅x−1=x3−1=x2x^{3} \cdot x^{-1} = x^{3-1} = x^2. For y: y2⋅y4=y2+4=y6y^2 \cdot y^4 = y^{2+4} = y^6. Final: 6x2y66x^2 y^6. Correct: A.

Comprehensive and Detailed Explanation (150–250 words):

DNA polymerase adds nucleotides to a growing strand using a template strand during replication. RNA polymerase (B) transcribes DNA into RNA. Ligase (C) seals Okazaki fragments. Helicase (D) unwinds DNA but does not synthesize. Correct: A.