Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Each Volvox , shown in Figure above , is a colonial organism. It is made up of between 1,000 to 3,000 photosynthetic algae that are grouped together into a hollow sphere. The sphere has a distinct front and back end. The cells have eyespots, which are more developed in the cells near the front. This enables the colony to swim towards light. Answer: eyespots
A:
What do the cells in the front of a volvox typically develop to help swim towards light?