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.
While properly cooking and then eating food that had stayed frozen at 0Â°F for years won't necessarily get you sick, you probably won't like how it tastes. So the USDA recommends tossing uncooked roasts, steaks and chops after a year in the freezer, and uncooked ground meat after just 4 months. And frozen cooked meat should go after 3 months. While expired frozen meat may look all right to eat, the safest bet is to mark an expiration date on the meats to keep yourself and carnivores in your family safe from food-borne illnesses. [via BusinessInsider.com]