The yearly return of a date (A) anniversary (B) centenary (C) connection (D) division​

Property 1 If a number is divisible by another number then it is divisible by each of the factors of that number.If abc are three natural numbers such that a is divisible by b and b is divisible by c then a is divisible by c also.

The difference of the squares of two consecutive odd integers is divisible by 3 (b) 6 (c) 7 (d) 8

There is no cell division involved in (A) spermatogenesis (B)Oogenesis (C) embryogenesis (D) spermiogenesis

The product of the predecessor and successor of an even natural number is: divisible by 2 (b) divisibly by 3 (c) divisible by 4 (d) an odd number

B.O.D. is connected with

The product of the predecessor and successor of an odd natural number is always divisible by 2 (b) 4 (c) 6 (d) 8