I am no expert but I think the correct answer is C.
Answer: After consolidation, long-term memories are stored throughout the brain as groups of neurons that are primed to fire together in the same pattern that created the original experience, and each component of a memory is stored in the brain area that initiated it (e.g. groups of neurons in the visual cortex store a sight, neurons in the amygdala store the associated emotion, etc).
Explanation:
They appear to be green because of the chloroplast in the cells.
The density of the water causes pressure, which causes water to move.
