I have branches, but no fruit, trunk or leaves. What am I?

What runs around the whole yard without moving?

What does this mean?

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How many Watermelons are there in the below picture?

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

If you say my name, I will no longer exist. What am I?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

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