Can you name an animal whose killing cannot be performed without spilling your own blood?

Can you find the odd one out from the below words ?

First Second Third Forth Fifth Sixth Seventh, Eighth Nine Ten Eleven Twelve.

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

Complete the table series riddle by finding the number that can replace "??".

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

The husband and wife were jogging in the morning. To match every two steps of the husband, the wife required three steps. If Both of them start with the here right foot. After how many steps do their left foot be together?