Question: What Are the Elements in the Human Body? Answer: Most of the human body is made up of water, H2O, with cells consisting of 65-90% water by weight. Therefore, it isn't surprising that most of a human body's mass is oxygen. Carbon, the basic unit for organic molecules, comes in second. 99% of the mass of the human body is made up of just six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. You may also wish to view the element composition of an average human body by mass.
1 The freezer time shown is for best quality only â foods kept constantly frozen at 0Â° F will keep safe indefinitely.  How long does cooked steak last at room temperature? Bacteria grow rapidly at temperatures between 40 Â°F and 140 Â°F; cooked steak should be discarded if left for more than 2 hours at room temperature.
Here's a guide to help you know how long you can keep cuts of meat around! Kitchen Fact: Raw ground meats and poultry should be cooked in 2 days, and roasts, steaks, and chops should be cooked in five days. For raw poultry, ground meats, and other chopped-up cuts of meat, cook them within two days. Larger cuts â like roasts, steaks, and chops â can be stored a bit longer, but should be used within five days. If you don't have time to cook the meat at the end of these time periods, just freeze it, as freezing will halt any bacteria growth.