For photosynthesis to occur plants need sunlight water and carbon dioxide and chlorophyll. Through the process of photosynthesis plants cover light energy into chemical energy they use this energy to make food which they store as sugars
It is your circulatory system that takes nutrients and oxygen to cells and takes CO2 from them
Separate kingdoms but fossil evidence shows they have evolved from a common ancestor
Because it requires air, or oxygen to complete. Aerobic means with air. Therefor, cellular respiration is an aerobic process. I hope this helps, if you have a question, feel free to ask !