Molecular clock data place the evolution of diatoms around the time period following the Permian extinction. One hypothesis is that an adaptive radiation occurred as they colonized new marine niches. Based on what you know about the effects of ocean acidification on the formation of tests made from calcium carbonate and the composition of the tests (cell walls) of diatoms, what is a possible explanation for this diatom "explosion"? Edit View Insert Format Tools Table 12pt v Paragraph V APR C

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Animal Phylogeny

Cladistics is a method of biological classification where organisms are classified based on their ancestors and their relationship with them. It is defined as the concepts and methods for determining the branching patterns of evolution and evolutionary history. Some scientists, however, have preferred the term phylogenetic systematics or phylogenetic taxonomy to emphasize the reliance on a phylogeny for classification. It is the most common and accepted method for classifying organisms.