Question

1. why is life on earth often described as carbon - based?

Explanation:

Carbon can form a vast number of complex and stable compounds due to its ability to form four covalent bonds. It is a key - element in biological molecules like carbohydrates, lipids, proteins, and nucleic acids which are essential for life processes such as energy storage, structure, and information transfer.

Answer:

Life on earth is often described as "carbon - based" because carbon is the fundamental element in biological molecules that are crucial for life processes.