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6 - -Mollusks annelids arthropods and echinoderms use...

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AP Biology Campbell Textbook Notes Invertebrate Evolution - 573: 543 mya: Oldest fossils in Endiacara Hills of Australia, called Endiacaran animals. Were segment, and had bilateral symmetry, but no specialization in cells. - 544 : ... mya. Burgess Shale of Canada animals had body symmetry, segmentation, front and back end, and appendages specialized. - Cnidarians and echinoderms: radial sym - Worms, mollusks, and arthropods: bilateral sym caused evolution of cephalization (concentration of nerve cells in front of body) - Flatworms: acoelomates. Roundworms: pseudocoelomates. Annelids, mollusks, arthropods, and echinoderms: true coeloms. - Blastopore deuterostomes anus ... echinoderms and chordates protostomes mouth... worms, mollusks, arthropods - Sponges break down food thru intracellular digestion, by digesting food inside cells
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Unformatted text preview: -Mollusks, annelids, arthropods, and echinoderms use extracellular digestion, by breaking down food outside the cells in a digestive cavity.-ALL respiratory systems are large and in contact with air or water, and are moist. -In small animals, excretion is done thru diffusion-Open circulatory system: blood partially contained within blood vessels and goes into sinuses.-Closed circulatory system: heart like organ forces blood thru vessels throughout the body.-Three trends in evolution of nervous system: centralization, cephalization, specialization.-Three main kinds of skeletal systems: hydrostatic (annelids and cnidarians), exoskeletons(arthropods), endoskeletons(echindoerms).-External fertilization: eggs fertilized outside F’s body , Internal : eggs fertilized inside F body....
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