In addition to sunlight, what two substances are required for the start of photosynthesis?

Where in the body can you find chemoreceptors? a. on the skin and ears, to detect pressure, touch, motion, and sound b. on the retina, to detect a single photon of light c. on the skin, to detect temperature or specific chemicals d. on the tongue and in the nose, to detect taste or odor

In the practice of science, this type of reasoning is used to develop explanations.

What is the starting point in replication called