What Defines Earth’s Living Beings? Earth’s living beings encompass all organisms, from microscopic bacteria to towering trees, from humans to majestic whales. These beings are classified into major groups like plants, animals, fungi, and microorganisms. What sets them apart is their ability to grow, reproduce, and adapt to their environments. But what makes Earth’s living […]

How Much Oxygen Does Earth Have? Oxygen is one of the most essential components for life on Earth. It makes up about 21% of Earth’s atmosphere, totaling approximately 1.2 quintillion kilograms (1,200,000 trillion tons). However, the amount of oxygen is not static; it is part of a complex cycle that involves production, consumption, and storage. […]