Question

what are three characteristics of earth that make it suitable for life? (15 points)

Explanation:

1. Suitable temperature: Earth's distance from the Sun and its atmosphere regulate temperature. The atmosphere traps heat through the greenhouse - effect, maintaining a range where liquid water can exist.
2. Liquid water: Water is essential for life as a solvent for biochemical reactions, a medium for transporting nutrients and waste, and involved in many metabolic processes. Earth has abundant liquid water on its surface.
3. Oxygen - rich atmosphere: The presence of oxygen in Earth's atmosphere, produced mainly by photosynthetic organisms like plants and algae, is crucial for aerobic respiration, a process that releases energy for most complex life - forms.

Answer:

1. Suitable temperature
2. Liquid water
3. Oxygen - rich atmosphere