Answer: The Sun helps sustain life by providing warmth to Earth so we are not an ice-cold planet. The Sun provides sunlight that helps plants to grow which humans and animals eat. (Third Optional sentence) The Sun also helps us by helping plants grow which provides oxygen for us.
the sun sustains life on Earth by keeping us warm. the sun is basically a huge fireball positioned far enough away it keeps us warm but not too warm and keeps us from freezing to death.
