What does this below rebus puzzle mean?

The Little ant seems to be always confused. Do you know why?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

No one wants to have it, but if one got it, he does not want to lose it. What is It?

Find out the number of circles in the given picture having Illusion

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

Identify the hidden meaning behind this picture?

Different lights make me strange by changing me into different sizes. What am I?