There are many things that can affect ocean currents. Particularly wind. Changes in temperature with air currents and tides affect it as well.
Sensory neurons are types of brain cells that convert the stimuli coming from the senses (hearing, touch, smell, taste, and sight) into information that would allow the brain to interpret it as a sensation. For example, they convert the messages from the optical nerve if the object is of a light color or not.
The correct answer is Chloroplast
Mitochondria is the powerhouse of the cell while the cell wall protects the cell from outside influence.