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.
How soon should beef be cooked after thawing? After thawing beef in the refrigerator, you don't have to cook it right away. Ground beef can be stored an additional 1 to 2 days before cooking; beef roasts and steaks may be stored 3 to 5 additional days before cooking. If beef is thawed in cold water or in a microwave oven, it should be cooked as soon as it is thawed. For more thawing information, go to The Big Thaw. Was this answer helpful?