What are characteristics of animals?
Answer and Explanation:
All animals have certain characteristics that are the same, no matter what type they are. All animals are made up of cells, the smallest building blocks of anything that is alive. Specifically, animals are made of eukaryotic cells that have no cell wall. This type of cell is complex, with a membrane-bound nucleus and many different organelles doing specific jobs. Animals are also multicellular, made up of millions upon millions of cells. Animals are also heterotrophic, which means that they cannot make their own food through the process of photosynthesis, like plants. Animals must find and ingest food for nutrition and energy. Animals also have the capability to move, allowing them to find food.
Almost all animals have cells that are organized into tissues, and tissues that are organized into organs. Organs then make up systems that allow the many parts of the animal to function properly. For example, many animals have circulatory systems by which some type of fluid such as blood moves around the body. Animals also have sensory structures that allow them to detect stimuli and respond to it. Many animals have some type of structure such as an internal or external skeleton. Almost every animal reproduces sexually, with the fertilization of a female egg by a male sperm.
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from High School Biology: Tutoring SolutionChapter 22 / Lesson 8
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