Organs are organized into systems. Each system of your body does a particular job. ... For example, to perform the job of digesting food, the digestive system needs the mouth, teeth, tongue, throat, stomach, intestines, and glands. Each system in the body depends on other systems to help it to do its work. ... The circulatory system also depends on the digestive system to break down food so that the blood can carry it to the body cells. ...

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Classification of Living Things Classification is defined as identification, naming, and grouping of organisms into a formal system based on similarities such as internal and external anatomy, physiological functions, genetic makeup, or evolutionary history. ... Scientists compare the external shapes and sizes of organisms as well as the anatomy and function of internal organs and organ systems, such as the digestive or reproductive systems. ... Animals are the only living things that have evolved nervous systems and sense organs that monitor their surroundings. ... In orde...

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biology Living things make up the world as we know it. Living things are involved in our life constantly, seeing that we are alive. There are five characteristics that are common to all living things. Living things are made up of one or more cells. Each cell is made up of living matter and is separated by a barrier that encloses the cell from its surroundings. ...

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Important Facts the smallest unit of life is the cell instructions for development are contained in DNA collectively, all of the chemical processes in a cell are called metabolism producers often obtain energy from the sun homeostasis refers to the ability to maintain a constant internal environment cells in domains archaea and eubacteria lack nucleii plants are multicellular producers an educated guess might be called a hypothesis science is based on evidence philosophy is not a step in the scientific method an atom is the smallest unit of substance that retains the properties of the subst...

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• Grade Level: High School