What has one letter and starts with an E?

What demands an answer, but asks no questions

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

How many times can you subtract the number 5 from 25?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

I am the fastest animal but cannot climb the tree. What am I?

What jumps when it walks and sits when it stands?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?