Living organisms are made up of organic matter. We as human are made up of nutrients and water and chemicals. While those structures like bridges are made from hard materials, some forged by man and some found in earth like metal and gold. They can heat up and be molded while living organisms die or burn to ashes
filling your refrigerator with eggs, meat and other foods that require cooking
All cells come from pre existing cells because if the cells never existed, then the cells could never be created. Cells multiply, from one another constantly forming from cells before them.