They provide half lives by radio active decay that can tell how old they are and earth also they provide analogous and and homologous structures
Sometimes they're used as drugs. The classic example might be penicillin, a compound made by a fungus and used as the first widely-available antibiotic.
Hello! :)
It turns out that there are at three simple machines found in a bicycle: lever, pulley, and wheel-and-axle. There are three more kinds of simple machines: an inclined plane, a wedge and a screw. When a machine is comprised of more than one type of simple machine, it is called a compound machine.
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~ Destiny ^_^
Explanation:
<em>The disadvantage of a closed circulatory system is that with the blood always contained in vessels, it's under higher pressure. This means it can flow faster, which is necessary for supporting the metabolic rate of more complex animals such as vertebrates. Open circulatory systems are low-pressure systems that cannot meet the needs of a fast metabolism</em>.
