What does this below rebus puzzle mean?

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

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

How can you drop a raw egg from a height onto a concrete floor without cracking it?

Can you count the number of triangles in the given picture?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?