Question

1. why is the suns heat important to earth in regard to the water cycle? 2. how is sunlight important to the biosphere?

Explanation:

1. The sun's heat causes water on Earth's surface (oceans, lakes, rivers) to evaporate into water vapor, starting the water - cycle. This vapor rises, cools, condenses into clouds, and then falls back to Earth as precipitation.
2. Sunlight is crucial for photosynthesis in plants. Through photosynthesis, plants convert carbon dioxide and water into oxygen and glucose, providing oxygen for respiration of most living organisms and forming the base of the food - chain in the biosphere.

Answer:

1. The sun's heat causes water evaporation, initiating the water cycle.
2. Sunlight is essential for photosynthesis in plants, which forms the base of the biosphere's food - chain and provides oxygen.