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Ch. 18+22+25 notes

notes on chapters 18, 22, and 25

QuestionAnswer
goal in systematics to organize living things into groups that have biological meaning
Linnean classification puts living things into categories
Dichotomous key used to put organisms into categories
goal in modern evolutionary classification to group species into evolutionary descent, instead of similarities and differences
cladogram links groups of organisms by showing their descent from common ancestors
Porifera sponges; thick sacs of cells with pores
Coelenterata coelenterates; central cavity and mouth; most have tentacles; some attached to the bottom of the ocean
Platyhelminthes flatworms; flattened bodies; live in water; parasites
Nematoda roundworms; round bodies; live on land or water; parasites
Annelida segmented worms; bodies divided into segments; segments have bristles; live on land or water; not parasites
Mollusca mollusks; soft bodies; some have shells on the outside; live on land or water; most have a thick, muscular foot to move
Arthropoda arthropods; bodies divided into segments; legs have joints for movements; bodies have exoskeletons made of chitin; can liove on land or water
Echinodermata echinoderms; spiny or leathery skin; radial symmetry; live in salt water; water vasular system for movement; tube feet attach to other objects
Cordata chordates; internal skeleton made of bones or cartilage; specialized body systems for digestion, circulation, and central nervous system; can live on live or water
biggest classification domain
kingdom smaller than domain but bigger than phylum
phylum smaller than kingdom but bigger than class
class smaller than phylum but bigger than order
order smaller than class but bigger than family
family smaller than order but bigger than genus
genus smaller than family but bigger than species
species smallest classification; smaller than genus
Created by: Tyl3r10959
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