Living Things Essay example

623 Words Oct 14th, 2013 3 Pages
What Is a Living Thing?
Living things are systems or organisms that tend to respond to changes in their environment and inside themselves, in such a way as to promote their own continuation and longevity. These are the ones that have the ability to breathe or respire, can move or navigate and consequently have the ability to multiply. These living things include human beings, plants, insects, animals among others. A living thing is defined as using all of these qualities: movement, respiration, sensitivity, growth, reproduction, excretion, and nutrition. Only living things, and all living things, have these functions. A living thing is any organism that displays all the characteristics of life. These include being able to grow and
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Heterotrophs (animals and humans) must ingest food for this purpose.
Theme#4 - Homeostasis
All organisms have stable internal conditions which must be maintained in order to remain alive. These include temperature, water content, heartbeat, and other such things. In a way, this has to do with energy use, because a certain level of energy must be kept within the body at all times. For this, obviously, humans must then ingest food on a regular basis. Not all conditions are for the body to maintain itself; though most are.
Theme#5 - Growth
All organisms grow and change. Cells divide to form new, identical cells. Differentiation happens, as well, when cells mutate into other types of cells, making a more complex organism. Organisms growing, changing, and becoming more complex is called development. Single-celled organisms do grow as well, but they will only become slightly larger - this is nearly unmeasurable.
Theme#6 - Reproduction
All organisms reproduce in order to continue the species' life. This is combining genetic information (in sexual reproduction) or splitting into two organisms (in asexual reproduction) in order to create another of the same species. In sexual reproduction, the new organism will have some characteristics from the mother, and some from father. It may look like either of them, or it may not. In asexual reproduction, the new organism is an exact copy of the

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