Identify the missing letter in the series: Z, Y, X, W, ?

A. V

Complete the series: B, D, F, H, ?

A. J

What letter comes next in the series: M, O, Q, S, ?

B. T

A, C, E, G, ?

A. I

Identify the missing number in the series: 1, 4, 9, 16, ?, 36

A. 25