Question

Two processes are basic to life on earth. What are they? How do these processes sustain life?

Answer 1

Respiration and Photosynthesis.
Respiration in human and animals is important to sustain life.It provides our body with oxygen and energy.
Photosynthesis is the process by which plants make their own food.They produce Oxygen in this process which is important for the life of human beings and animals to respire.

so...these processes sustain life and are basic on Earth.

Answer 2

Respiration and Photosynthesis. ... Photosynthesis is the process by which plants make their own food. They produce Oxygen in this process which is important for the life of human beings and animals to respire. so...these processes sustain life and are basic on Earth.