You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

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

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

which number am I?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

What is the difference between a jeweller and a jailer?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Replace the question mark in the picture below.

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.