FIN 3826 Chapter : Chapter 1
Document Summary
23. 1 key features of animals: multi-cellular, no cell wall, obtain energy by consuming other organisms, most reproduce sexually they are motile at some point in the life cycle they are able to respond rapidly to external stimuli. Phylum porifera sponges immobile reproduce asexually by budding reproduce sexually through fusion of sperm and eggs: no true tissues or organs, sponge body perforated by tiny pores, some contain chemicals useful to humans. Phylum cnidarian: seas jellies, sea anemones, corals, hydrozoans, sea wasps, have stinging cells called cnidocytes. Phylum ctenophora: comb jellies, similar to cnidarian, use cilia to move, carnivorous, most are hermaphroditic. Attach themselves to the lining of the intestine can grow up to 20 feet in length by absorbing nutrients in the intestine. Phylum mollusca: most have shells, reproduce sexually. Includes clams, snails, and cephalopods: some species have separate sexes, others are hermaphroditic. Phylum arthropoda: most diverse and abundant animals.
