Fragmentation, also known as splitting, as a method of reproduction is seen in many organisms such as filamentous cyanobacteria, molds, lichens, many plants, and animals such as sponges, acoel flatworms, some annelid worms and sea stars.
A animal has to have oxygen to live, some animals have evolved to not having oxygen,https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjxv4f49ePL...a web site telling about the animals that have evolved.
When you take the food into your mouth and chew on it, your salivary glands secret enzymes called salivary amylase which is responsible for breaking down starch to smaller carbohydrates, like starch. Basically, the process of taking in the nutrient of the food to the body begins by breaking it down to smaller components.
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kidney, liver, lung. I hope this helped:))
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