Why do humans only have a short time ok n Earth if the Earth was formed 4.6 billion years ago

What is the difference between how ionic and covalent bonds form

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

What is any method of measuring the age of an object or event in years, such as using atomic half-life?