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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

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....
View Full Document

This note was uploaded on 01/02/2012 for the course BIO 101 taught by Professor Dr.chan during the Fall '11 term at Marine Biological Laboratory.

Ask a homework question - tutors are online