Management and economics of energy are important for fitness. Animals allocate resources for reproduction, growth, and maintenance. R type species have short life spans and lots of reproduction while K type species have long life spans and produce few offspring that they invest a lot of energy into. The rate of energy usage is also an important consideration. The rate of energy usage determines how quickly an organism will go through their stored resources and how much food is required to get from the environment. Organisms have unique physiological and anatomical traits that help them manage energy acquisition, storage, and utilization.
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