What brings you down but never up?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

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

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

A man fell off a smuggling boat into deep water. He could not swim and he was not wearing anything to keep him afloat. It took 30 minutes for the people on the boat to realize someone was missing. The missing man was rescued two hours later on the return trip. Why didn't he drown? Note:- He didn't know swimming, the sea was deep, and He wasn't holding anything

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

What is 3/7 chicken, 2/3 cat and 2/4 goat?

What is the next number in this series?

4,12,84,3612....