The hippocampus is a brain structure that is involved in the formation of

Memories.  
The hippocampus is a little organ situated inside the cerebrum structures. it is an essential piece of the limbic framework, it is the the area that manages feelings, remembering of things . The hippocampus is related primarily with memory, specifically long haul memory

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.

Aplant cell has vacuoles and a cell wall