Final answer:
Earth's habitability is due to its perfect distance from the Sun, suitable atmosphere with essential gases, presence of liquid water, and a robust biosphere. These conditions foster an environment where life can thrive, especially in the Sun's habitable zone.
Step-by-step explanation:
The Earth possesses unique characteristics that make it habitable for life, such as its optimal distance from the Sun, allowing for suitable temperatures for biological processes. Its atmosphere has a balanced mix of gases necessary for life, including oxygen for respiration and carbon dioxide for photosynthesis.
Additionally, Earth has an abundance of liquid water, which is crucial as a solvent in biological reactions and as a habitat for many organisms. The presence of a robust biosphere, involving the intricate interaction of life with the planet's surface, oceans, and atmosphere, brings planet-scale changes that signify the vibrancy of life. Earth's position within the Sun's habitable zone ensures the availability of liquid water on the surface, conducive to life flourishing in diverse forms.