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We know M, N (2 seats away clockwise), and K (opposite M). But without knowing other people's positions or exact starting point, the person between K and N cannot be uniquely determined.

Each letter is replaced by its position in the alphabet: C=3, A=1, T=20, S=19. Similarly: D=4, O=15, G=7, S=19. Answer: 4-15-7-19.

Odd numbers: 1, 3, 5 (A could have any). Prime numbers: 2, 3, 5 (B could have any). Divisible by 2: 2, 4 (C could have any). Multiple assignments possible.

The series is in reverse alphabetical order, decreasing by 1 each time. After U comes T, then S.

In a circle of 6: A opposite D means 3 positions apart. If B is right of A, and counting clockwise: A, B, ?, ?, ?, ?. D is opposite A. The person left of D (right side from D's perspective) is C.

T→G (reverse), E→2, L→O (reverse), E→2, P→K (reverse), H→S (reverse), O→4, N→M (reverse), E→2. Gives: G2O2KS4M2. Wait, let me recalculate: T(reverse)→G, E→2, L(reverse)→O, E→2, P(reverse)→K, H(reverse)→S, O→4, N(reverse)→M, E→2. Check option more carefully - answer is C.

As trunk is a distinctive feature/characteristic of elephant, pouch is a distinctive feature of kangaroo. The analogy is based on unique features.

If P is 5th from the left in a row of 8, then positions 6, 7, 8 are to the right. That's 3 people.

Walking 10 km N, then 10 km S cancels out vertically. Walking 5 km E, then 5 km W cancels out horizontally. The person returns to the starting point.

Since some vertebrates are aquatic and no aquatic animals are terrestrial, some vertebrates (aquatic ones) are not terrestrial. Mammals are vertebrates, so some mammals may not be terrestrial.