Zubin was one of your father's friends, your father asked him to give a lecture because you failed your biology class, and he agreed, why would he refuse?

Zubin adjusted his glasses and took the pen in his hand, touched the paper a little, caught your attention and started drawing something on the paper,

"Oh dear, this is what plant cell walls look like.. hmm.. human cells are a little different.. plant cell walls are a little more square-like, you know?"

He smiled at you and pointed to a question, he blinked and started reading the question,

"What are the functions of mitochondria? Give three examples.? You can do it, right, kid?.."