Answer:
b. light speed
Explanation:
Light speed.
This is the distance that light travels in a year, aprox 9.46 trillion Kilometers.
Answer:
In plants and algae, which developed much later, photosynthesis occurs in a specialized intracellular organelle—the chloroplast. Chloroplasts perform photosynthesis during the daylight hours. The immediate products of photosynthesis, NADPH and ATP, are used by the photosynthetic cells to produce many organic molecules.
I would say communication, as neurons transmits messages from one part to another part of the body