* Focus on living organisms: Photosynthesis is the process by which plants and some bacteria convert light energy into chemical energy. It's a fundamental process for life on Earth.
* Involves biological structures: The process takes place within the chloroplasts of plant cells, utilizing specific molecules like chlorophyll.
* Study of life processes: Photosynthesis is studied in the context of understanding how organisms function, their energy requirements, and their interactions with the environment.
While photosynthesis plays a crucial role in the Earth's atmosphere and climate (an aspect of Earth science), its core mechanism is inherently a biological process within living organisms.