Pick 3 invertebrates Compare them in terms of physical features and systems. Identify at least 3 similarities and 3 differences Include pictures and References
Echinoderms: Starfish
-Most echinoderms have arms or spines that radiate from the center of their body.
-The central body contains their organs, and their mouth for feeding.
-Starfish have 5 or more arms attach to its body
-Starfish have tube feet to help with locomotion and feeding.
-The mouth is underneath the tube feet
-The stomach sack can come out through the mouth to engulf and digest food, such as clams and mussels.
-Have bony ossicles in their body.
-Have a water-vascular system that support small jaws.
-Have radial symmetry and most can regenerate lost limbs.
-bilateral symmetry (meaning each side of the body is a mirror image of the other)
http://www.cyhaus.com/marine/Echinoderm.htm
http://www.kidport.com/reflib/science/animals/Echinoderms.htm
INSECTS: Ants
-Have an exoskeleton which makes it harder to grow and get larger
-Body consists of 3 parts: the head, thorax and abdomen.
-The head has a pair of antennae, and a pair of compound eyes.
-The thorax contains the legs for locomotion. The thorax may also have wings for flying.
-The abdomen contains many body organs, such as the heart, respiratory system, digestive system and reproductive system.
-Have six legs
-Bilateral symmetry
-Must undergo metamorphosis: complete or incomplete
-Must molt in order to grow
http://www.kidport.com/reflib/science/animals/Insects.htm
http://www.ento.csiro.au/education/what_invertebrates.html
Arachnids: Spiders & Ticks
-Type of arthropod
-Have 8 legs, all used for locomotion
-Both pair of legs can also used for holding prey and feeding.
-Have 8 eyes
-Have fangs that are used to inject poison to paralyze or kill their prey
-Produce silk threads to spin webs for catching prey, or for building an egg sack
-Have a hard exoskeleton and jointed appendages for walking
-Bilateral symmetry
-Can also be parasitic mites or ticks that transmit disease
-Undergoes incomplete metamorphosis
http://www.kidport.com/reflib/science/animals/Arachnids.htmhttp://www.biokids.umich.edu/critters/Arachnida/
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