Chapter 26Sponges and Cnidarians


Section 26-1: advent to theAnimal KingdomAn pet is a multicellular,eukaryoticheterotroph whose cells absence cell walls.Animals are committed to carry out the following essential functions: feeding, respiration, circulation, excretion, response, movement, and reproduction.In general, facility animals tend to have actually high levels of cabinet specialization and also internal organization,bilateral human body symmetry,cephalization, and a body.

You are watching: The simplest animals to have body symmetry are

invertebrate, vertebrate,feedback inhibition, blastula, protostome,deuterostome, anus, endoderm, mesoderm, ectoderm,radial symmetry

Spineless Video, part 1 Spineless Video, component 2

Animal CladogramEarly development of an animal EmbryoRadial and Bilateral Symmetry

Section 26-2:SpongesSpongesare share as pets because they are multicellular, heterotrophic, have no cell walls, and contain a few committed cells.The activity of water with a sponge offers a basic mechanism because that feeding, respiration, circulation, and also excretion.

osculum,spicule,choanocyte,archaeocyte, internal fertilization, larva,gemmule

The body of a SpongeSexual Reproduction in a Sponge

Structure of a SpongeActivity

Section 26-3:CnidariansCnidariansare soft-bodied, carnivorous pets that have actually stinging tentacles arranged in circles about their mouth. They space the simplest pets to have actually body the contrary and dedicated tissues.Cnidarians generally have a life bike that has two different-looking stages, apolypand amedusa.Cnidarians includejellyfishes,hydrasand your relatives,sea anemones, andcorals.

cnidocyte,nematocyst,gastrovascular cavity,nerve net,hydrostatic skeleton, outside fertilization

Life bicycle of a Cnidarian

The Polyp and also Medusa step of a CnidarianLife bicycle of the JellyfishAurelia

Bioluminescent Jellyfish

Examining the Responses the Hydras

26-3 rap Data Table record Sharing

Symmetry: principle Map

•oData Sharing: analyzing the Responses of Hydras

•oMiller & Levine: Sunscreen native the Sea

•oSciLinks: Classifying Animals



The fact Behind SpongeBob- If too lot TV-watching has actually you reasoning that sea sponges are square, yellow and also talkative, this ocean Futures society website will help you acquire your facts straight. It provides theSpongeBob SquarePantscartoon characters as a communication for introducing the fascinating creatures and also coral reefs thatreallylive under the sea.

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Cities Under the Sea: Coral Reefs- go your family members like the movieFinding Nemo? in ~ this ocean Future society website, Jean-Michel Cousteau invites kids to visit Nemo's home and also learn what actual coral reefs room like. The site describes what corals are, describes the importance of reef biodiversity and lists the eco-friendly threats reefs face. Each section consists of photos, video clips and audio narration.