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All living organisms share several key characteristics: order, sensitivity/ response to their environment, reproduction, growth and development, regulation, homeostasis, and energy processing. When viewed together, these characteristics serve to define life.
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Muscles can also receive messages from the brain when the body temperature decreases. They respond by shivering. Shivering causes the muscles to contract and relax quickly. This process generates heat.
<span> RNA was thought of as little more than a messenger between DNA and proteins, carrying instructions as messenger RNA (mRNA) to build proteins. However, RNA can do far more. It can drive chemical reactions, like proteins, and carries genetic information, like DNA. And because RNA can do both these jobs, most scientists think life as we know it began in an RNA world, without DNA and proteins.</span>
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sustancia formada por dos o más componentes unidos, pero no combinados químicamente. Las mezclas homogéneas no se pueden diferenciar a simple vista. Se conocen como soluciones que contienen un soluto y un solvente; por ejemplo, la sal mezclada con agua
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