Invertebrates

Review for Test By: Maddy J.

Sponges is an animal that filters the water that it lives in to get food. Some of the characteristic of the sponges are-

reproduce asexually

- can’t move once they attach as adults

- gets food from environment around it.

- between inner and outer layer there is a jelly-like layer

- grow at almost any depth

- grow on hard surfaces

- shaped like fingers, tree branches or round

- filters water to get its food

- 5000 known species

-no real digestive system






Cnidarians are animals that has the ability to sting its prey, carnivorous animals, or meat-eating, poison in tentacles. Some of their characteristics are-

tentacles that sting its predators and bring food to mouth (digestive system)

waste leaves through mouth

no organs, cells organized instead of tissues, outer layer is protection and inner layer is used for digestion

live in water

radial symmetry

Polyp or Medusa Form

reproduce sexually and asexually




Segmented worms are are worms whose bodies are made up of connected sections, or segments. Some of their characteristics are-

body made up of connected segments

circulatory system - 5 enlarged tubes that act like hearts

nervous system - brain and main nerve

breath through skin

two sets of muscles that allow it to move

takes in food through mouth

reproduce sexually



Round worms are a worm with a round, tube like body. Most are too small to be seen. Some characteristics are-

digestive system with 2 openings

take in food and eliminate waste

muscles that run length of body

reproduce sexually

nervous system with brain and simple sense organs