Courtney believes that the dinosaurs went extinct as a result of a giant asteroid hitting the earth. scientists discovered a 150 km wide crater dating back to the time of their extinction, according to the fossil record. the crater and the fossil record are examples of researched data that support courtney’s explanation.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

d. changes in climate and historical records

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linnaeus is the father of taxonomy, which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.