Science 5 UNIT 5 INVERTEBRATES

UNIT 5 INVERTEBRATES

•         5.1 TYPES OF INVERTEBRATES

Invertebrates are animal without backbone. Invertebrates can be grouped based on their common characteristics. Some invertebrates have jointed legs and some do not. 

Some invertebrates with jointed legs are:

Insects, Spiders, Millipedes, and Crustaceans.

Some invertebrates without jointed legs are

Starfish, sea urchin, and sea cucumber

Jelly fish, corals, and sea anemones

Sponges

Snails, slugs, clams, and mussels

Worms

5.8 COMPARING INVERTEBRATES

Invertebrates	Habitat	Body structure
Insects, Spiders, Millipedes, and Crustaceans.	Insects, spiders, and millipedes are usually found in land Crustaceans are usually found underwater.	Have jointed legs, a segmented body, and hard exoskeleton.
Starfish, sea urchin, and sea cucumber	Found in the sea	Have bodies that are made up of equal segments. Each segment contain the same set of organs. Have spine like structures on their skin. Have tube feet which help them to move and feed.
Jelly fish, corals, and sea anemones	Found in the sea. Sea anemones spend most of their lives in one place.	Have a soft body. Have a mouth surrounded by tentacles.
Sponges	Found in the sea. The adult sponge permanently attaches itself to one place during its life.	Simple animal with holes on its body that filters out food from the water.
Snails, slugs, clams, and mussels	Found both on land and in water. Some of them live in salt water, and some live in fresh water.	Have a soft body and a foot. Some have tentacles on their heads. Snails, clams, and mussels have shells.
Worms	Found on land and water.	Have a body which can be divided into halves that are mirror images of each other. Many have sense organs. May have a smooth body or segmented body.

SCIENCE 5 UNIT 5 EXERCISE