Question

how does incoming solar radiation primarily support life on earth?
by causing tides in the oceans, impacting the hydrosphere
by regulating atmospheric pressure, influencing climate patterns
by driving photosynthesis, sustaining ecosystems
by affecting geological processes, altering the lithosphere

Explanation:

Photosynthesis is the process by which plants, algae, and some bacteria convert carbon - dioxide and water into organic compounds and oxygen using solar energy. This process forms the base of the food chain and sustains ecosystems. Tides are mainly caused by the gravitational pull of the moon and sun, not solar radiation's primary life - supporting role. While solar radiation affects climate, its main life - support is through photosynthesis. Geological processes are not the main way solar radiation supports life.

Answer:

By driving photosynthesis, sustaining ecosystems