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ARTHROPODS
Lesson 4 - Page 1

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* Internet



Students make a list of organisms on land and sea.

BACKGROUND:

Many groups of invertebrates have representatives that live in the oceans and on land. There are many invertebrates that live on land. Worms, insects, spiders, land snails, and many miscellaneous bugs are all land invertebrates. Shrimp, crabs, and clams are examples of marine invertebrates. Ask the students to describe the similarities and differences of each of the groups listed below. As they give their answers plot their data.

Organisms that live on land require mechanisms to make them mobile, in the ocean organisms can swim and float to find food. Imagine a seal on land getting food! A sealís body is not meant to be on land. There are smaller organisms that live in the oceans who get nourishment just by assimilating the needed minerals directly into their body. For instance, a person must each foods that contain calcium and phosphorous for strong bones. Clams on the other hand, can just take calcium directly from the ocean water and use it almost directly into its shell.

Birds have developed a way to fly, while it is not necessary for marine organisms to fly. Trees on land group large, while you do not have large plants that live in the oceans.
PROCEDURE:

1. Provide the students with books and/or internet access. It is an important skill for students to research information. You as a teacher can never give them all the answers, but providing them with a vehicle to learn on their own is invaluable.

2. In this exercise students will see if they can find any differences. Have them look at the different books and magazines before they describe differences of invertebrates with some vision of what they look like.

2.
  1.  
  2. In this exercise students will see if they can find any differences. Have them look at the different books and magazines before they describe differences of invertebrates with some vision of what they look like.
 

LAND

SEA

insects
ARTHROPOD

many types, small; many fly, usually
live in groups, 6 legs, 3 body segments

none

spiders ARTHROPOD

small, spin webs, 8 eyes, hairy legs

none

snails MOLLUSCA

spiral shell in most cases except slugs, breathe air

same except breathe through gills

clams
MOLLUSCA

none

2 shells that are identical, shells vary

worms
ANNELID

burrow tunnels, no skeleton, plain looking

have external skeletons, very beautiful feather- like bodies




 

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