INVERTEBRATES

ECHINODERMS

• Have brittle and spiny skin
• They have a circular shape
• Example: starfish
• Most have five arms coming from their center
• Starfish can pull open their food with suction cups

SPONGES

• Have their own phylum
• Example: venus flower basket sponge
• Can reorganize thier whole body from a single cell
• They filter food from the water
• Have two layers of cells

MOLLUSKS

• Have a single muscular foot
• Have a mantle
• Snails have a radula that can scrape algae off of rocks
• Most have a shell that protects them from pretadors
• Example: snail

CNIDARIANS

• Example: moon jellyfish
• They have radial symmetry
• They have two forms polyp, and medusa
• They live in water
• Most have tentacles with stinging cells on them

ARTHROPODS

• All arthropods have jointed legs
• Live on almost every continent
• Some are poisonous
• Example: black widow
• Spiders use poison to kill or paralyze their prey

SEGMENTED WORMS

• Example: earthworm
• Earthworms burrow by eating dirt
• Eathworms can live without a host unlike most other worms
• Earthworms are somtimes called a farmer's plow because
• Their tunnels allow plants to grow

FLATWORMS

• Example: Planarian
• Some flatworms are parasitic
• Flatworms have only one opening in thier digestive system
• Tapeworms are a type of parasitic flatworms
• Planarians are a type of free-roaming flatworm

ROUNDWORMS

• Example: hookworm
• Most roundworms are parasitic
• Some can cause diseases
• Hookworms can dig through the feet of its host
• Roundworms are almost micrscopic