Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Be active and find the killer in the picture Riddle below.

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

When does a USA Potato change its nationality?

Why is the Hole below a Lock?

Identify the 10 differences between the two given pictures.

As you can see in the picture, you have a hole with dimensions 9 ft x 2 ft Also available is a wooden board with dimensions 6 ft x 3 ft Now you have to cover the hole with this board and you are allowed to cut the board into two pieces. Please see that the hole is completely covered and the boards should not overlap or extend beyond the edge. How will you cut the board?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

What type of tree can I carry in my hand?

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91