A is brother of B, so B is A's sibling. C is daughter of B (A's sibling), and D is brother of C. Therefore, D is the child of B (A's sibling), making A the uncle of D.

Using set theory: Total = Cricket + Football - Both. 40 = 25 + 20 - Both. Both = 45 - 40 = 5.

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.

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.

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.

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

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.

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.

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

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.