What are the four basic elements of Fire?火灾发生的四个基本要素是? A. Heat, Fuel, Oxygen, and Chain Reaction 温度,燃料,氧勺和链式反应 B. Flame, Fuel, Oxygen, and Chain Reaction 火苗,燃料,氧和链式反应 C. Heat, Wood,Oxygen, and Chain Reaction 温度,木材,氧和链式反应 D. Heat, Fuel,...
"Of 118 elements, the last thing I read was that 97% of our body's weight is just four elements," Steven Townsend, an organic chemist at Vanderbilt University, told Live Science. Those four elements areoxygen, carbon, hydrogen and nitrogen. So what, exactly, do these elements do?
1Olivia ___ in the Empire State Building.Elements are all around us. Iron is one of the commonest elements found within the Earth. You probably know the element oxygen. It is the element that we b___in all the time. And elements can combine (结合) to make new things l___H2O. Th...
The elements of the general structure of an amino acid include carbon, hydrogen, oxygen, and nitrogen based on the carboxylic acid group and an amino...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your ...
(a) What are the two ways for oxygen transport in the body? (b) What makes it the most efficient? Oxygen Usage in the Body Oxygen is a very important nutrient in the body that is used in aerobic respiration. It acts as the final electron acceptor in the ...
Animal metabolism depends upon oxygen for almost all of its energy-generating processes. Yet this was not always so. Early in the history of the Earth, there was essentially no free oxygen anywhere, although oxygen has always been one of the most abundant elements on Earth. In the early ...
第1题 The two elements water is made are oxygen and hydrogen.A、that B、which C、of which D、with which 第2题 The crime was discovered till 48 hours later,gave the criminal plenty of time to get away.A、which B、that C、so D、what 第3题 The International Studies University,in 1951...
A fuel is a chemical that can be ‘burnt’ to provide useful energy. Burning normally means that chemical bonds between the elements in the fuel are broken and the elements chemically combine with oxygen (often from the air). For many years, we’ve used natural gas to heat our homes and...
the seventh element of the periodic table between carbon and oxygen is nitrogen. it’s an important part of amino acids. around eighty per cent of the earth’s atmosphere comprises nitrogen gas. it has no colour, mostly diatomic non-metal gas which is odourless and colourless in nature. ...
These are the first 20 elements, listed in order: H - Hydrogen He - Helium Li - Lithium Be - Beryllium B - Boron C - Carbon N - Nitrogen O - Oxygen F - Fluorine Ne - Neon Na - Sodium Mg - Magnesium Al - Aluminum Si - Silicon ...