How does every day?

By taxi

On taxi

In taxi

In taxi

Explanation:

If you said on taxi you would be saying on the taxi like on top of the taxi and by taxi you don't say if you are going inside but you are just saying you go to a taxi and in taxi you are saying you go in a taxi by actually going inside and you know they go in a taxi.

wheres the options? i dont think this can be solved with out the options

the krebs cycle and electron transport occur in the mitochondria, though other than that i would need to know more information.