Represent through a cladogram the evolutionary relationships among spiders, birds, porifera, Homo
sapiens, lampreys, nematodes, tuna, clam and jellyfish by listing them in order from most closely
related to most distantly related. Indicate in the cladogram where different types of body symmetry
arise in the evolutionary process.
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The most primitive animals, the sponges, first appeared in the fossil record about 700 million years ago. Animals diversified rapidly, and most of the major phyla fomred during the Cambrian explosion, about 535-525 millioni years ago.
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