Scientist rely on <em>Biology </em>concepts when researching crop production and medicine.
Answer:
Chlorophylls are natural green pigments ubiquitously present in plant kingdom, which play an important role in photosynthetic process, a vital function for life on Earth.
Explanation:
Your turn. Now you have to find the right answer based off my explanation
External stimulus. The rain is something out of your control while you're waiting. Rain is not something you are doing nor is it a response to you waiting for the bus.