oxygen important to us

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Oxygen plays a critical role in respiration, the energy-producing chemistry that drives the metabolisms of most living things. We humans, along with many other creatures, need oxygen in the air we breathe to stay alive. Oxygen is generated during photosynthesis by plants and many types of microbesWhy is oxygen important? Oxygen is essential for respiration because the body uses it to 'burn' food molecules. Animals take in oxygen when inhaling and give off carbon dioxide when exhaling. Oxygen makes up almost 21% of the total gases in air, with most of the remaining gas being physiologically inert nitrogenOxygen in cells occurs with carbon and hydrogen in most organic compounds that have either structural or metabolic functions. ... It is important for such significant biological processes as DNA synthesis, enzymes activation, cellular cycle regulation, gene transcription activation, and apoptosisAnimals need oxygen (O) to survive. In fact, all organisms need oxygen to complete the process to burning glucose for fuel. ... It's purpose is to bring oxygen into your body. One of the products of cellular respiration is carbon dioxideEven though oxygen is not a heat-trapping greenhouse gas, its concentration in our atmosphere can affect how much sunlight reaches the ground, and new models suggest that effect has altered climate in the past. ... “Oxygen is produced as a waste product of photosynthesisIf the world lost its oxygen for five seconds, the earth would be an extremely dangerous place to live in. Due to the severe sunburn, our inner ear would explode. The air pressure on the earth would drop 21 per cent and our ears would not get enough time to settleMost of the breathable oxygen in Earth's atmosphere is supplied by plant life in a process called photosynthesis . We'll run out of it if we cut down too much of the world's forests and kill too much plant life in the oceans. ... As long as we sustain Earth's plant life in sufficient quantity, we won't run out of oxygen.

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sun

The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as light and infrared radiation. It is by far the most important source of energy for life on Earth. Compared with the billions of other stars in the universe, the sun is unremarkable. But for Earth and the other planets that revolve around it, the sun is a powerful center of attention. It holds the solar system together; provides life-giving light, heat, and energy to Earth; and generates space weather.

The theory of relativity

by 'britannica' (www.britannica.com) relativity , wide-ranging physical theories formed by the German-born physicist Albert Einstein . With his theories of special relativity (1905) and general relativity (1915), Einstein overthrew many assumptions underlying earlier physical theories, redefining in the process the fundamental concepts of space , time , matter , energy , and gravity . Along with quantum mechanics , relativity is central to modern physics . In particular, relativity provides the basis for understanding cosmic processes and the geometry of the universe itself. (Read Einstein’s 1926 Britannica essay on space-time.) Explaining E = mc 2 See all videos for this article “Special relativity” is limited to objects that are moving with respect to inertial frames of reference—i.e, in a state of uniform motion with respect to one another such that an observer cannot, by purely mechanical experiments, distinguish one from the other. Beginning with the beh

friendship

A true friend is a friend when is convenient and when it is not. They standby you consistently both when you are present and when you are not. They're Authentic and Honest with You. True friends aren't phony with you. They show you who they really are.A good friend knows all your best stories, but a best friend has lived them with you." “Many people will walk in and out of your life, but only true friends leave footprints in your heart.” “There's nothing like a really loyal, dependable, good friend. ... "My best friend is the one who brings out the best in me."They’ve been there for you through the good times, the rough moments, and everything in between. They pick you up when you’re feeling down and lift you up even higher when you’re on top of the world. They’re the first person to like and comment on your summer Instagram captions or send you a birthday quote for best friends, and these best friend quotes will remind you just how special your bond truly i

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