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Comprehensive and Detailed Explanation (150–250 words):

The lens adjusts curvature to focus light from near or far objects onto the retina, a process called accommodation. The cornea (A) provides most refraction but does not change shape. The iris (C) controls light entry by adjusting pupil diameter. The retina (D) detects light but does not focus it. Thus, the focusing structure is the lens (B).

Comprehensive and Detailed Explanation (150–250 words):

Platelets (thrombocytes) initiate clot formation by adhering to vessel injury sites and releasing clotting factors. Red blood cells (A) carry oxygen, white blood cells (B) fight infection, and plasma (D) carries dissolved substances. Correct: C.

Comprehensive and Detailed Explanation (150–250 words):

LCM of 3 and 9 = 9. Rewrite: 2/3=6/92/3 = 6/9. Add: 6/9+4/9=10/96/9 + 4/9 = 10/9. Correct: B.

Comprehensive and Detailed Explanation (150–250 words):

During anaphase, spindle fibers shorten, pulling sister chromatids apart toward opposite poles. Prophase (A) involves chromatin condensation. Metaphase (B) aligns chromosomes at the equatorial plate. Telophase (D) reforms nuclear envelopes. The separation event defining anaphase makes C correct.

Comprehensive and Detailed Explanation (150–250 words):

The passage lists pollination, water purification, and climate regulation. Soil erosion (D) is not mentioned. Correct: D.