<span>During inspiration, after leaving the larynx, air enters the trachea.</span>
Natural selection a process that occurs over successive generations and is defined as the differential reproduction of genotypes. Natural selection requires heritable variations in a given trait
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Fossils, or preserved parts of organisms from the distant past, have shown that species change over time. Radiometric dating can be used to determine the age of fossils by measuring the how much of the radioactive materials in each rock layer have broken down.