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| Evolution - Cells, What Are They? |
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What is a cell?
A cell is a basic unit of life. They are tiny packets, or bags, of organelles, or tools, needed for the cell to survive. A cell can eat, move around, and reproduce. These cells took the chemicals of life found in the soup and put them together inside protective sacks. These first cells were very simple and because there was little or no oxygen available, they probably did not need it to survive.
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What did these first cells eat?
As strange as it may seem, the first cellular lifeforms on Earth probably ate soup. Not Chicken Noodle Soup, but the same soup that they formed in. At that time, there were plenty of proteins, amino acids, and lipids to go around. The first cells were probably all consumers, the ancestors of animals.
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Over millions of years' time, food supplies began to dwindle. As a result, new types of cells had to form. These cells were called producers. Producers evolved the ability to actually create their own food, using the chemicals around them and the energy from the Sun, or from heat found in the Earth. These producers would be ancestors to the plants.
  
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