Answer:
Photosynthesis is a process by which plants use the sunlight to make their own food. The main role of photosynthesis is to produce food for the plant.
They use radiometry and pyrometry
NASA uses the Transiting Exoplanet Survey Satelite (TESS) telescope that employes this technology
This telescope measures the brightness/luminosity of stars. When this brightness drops regularly, every more or less in the same number of years, then there is the likelihood of a planet orbiting the star. The dip in brightness of the star is directly proportional to the size of the planet and the distance between the star and the orbiting planet.
The S Phase is when the chromosomes duplicate
Agricultural use takes up 40% of their annual use in California