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.
Fresh beef roast, steaks, chops, or ribs 3 to 5 days 6 to 12 months. Fresh beef liver or variety meets 1 to 2 days 3 to 4 months. Home cooked beef, soups, stews or casseroles 3 to 4 days 2 to 3 months. Store-cooked convenience meals 1 to 2 days 2 to 3 months. Cooked beef gravy or beef broth 1 to 2 days 2 to 3 months.