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Animals: Plants
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Animals are multicellular organisms, but differ from the other two kingdoms of multicellular eukaryotes, the plants (Plantae) and the fungi (Mycota), in their structure and growth. Animals have developed muscles which give them mobility... a characteristic that has stimulated further development of other type of tissues and organ systems. Animals differ also in that they obtain energy by eating.
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Animals have several characteristics that set them apart from other living things. Animals are eukaryotic and usually multicellular[2] (although see Myxozoa), which separates them from bacteria and most protists. They are heterotrophic,[3] generally digesting food in an internal chamber, which separates them from plants and algae. They are ... distinguished from plants, algae, and fungi by lacking cell walls.[4] All animals are motile,[5] if only at certain life stages. Embryos pass through a blastula stage, which is a characteristic exclusive to animals.
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Animals that only eat plants are called herbivores. Other animals eat only meat, and are called carnivores. Animals that eat both plants and meat are called omnivores. Animals are divided into groups; see animalia.
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Most animals grow by indirectly using the energy of sunlight. Plants use this energy to convert sunlight into simple sugars using a process known as photosynthesis. Starting with the molecules carbon dioxide (CO2) and water (H2O), photosynthesis converts the energy of sunlight into chemical energy stored in the bonds of glucose (C6H12O6) and releases oxygen (O2). These sugars are then used as the building blocks which allow the plant to grow. When animals eat these plants (or eat other animals which have eaten plants), the sugars produced by the plant are used by the animal. They are either used directly to help the animal grow, or broken down, releasing stored solar energy, and giving the animal the energy required for motion.
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