Which concept explains that tortoises on the Galapagos Islands are very similar to a species found in South America?

answer; i believe that the correct answer is; ///bodies of water store heat during the day and release it at night;

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.