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HERE'S THE ANSWER
Diffusion is a process in which particles of two or more substances intermixed with each other.
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<span>A secondary consumer in a food web is the carnivorous or omnivorous animal that feeds on the primary consumer, which is the organism (normally a rat) that eats the producer (normally a plant).</span>
Answer: Because each one of them helps other organs, cells, etc.. Because everything in your body needs to work together. For example, one of the most important functions of organ systems is to provide cells with oxygen and nutrients and to remove toxic waste products such as carbon dioxide.