Invertebrates

Flatworms, arthropods, mollusks- Nathan

Flatworms

Flatworms

Flatworm -

Example: segmented worm, roundworm, planarian.



Characteristics: flattened body, digestive system with only one opening, nerves system, live in fresh water streams, eat through a straw like tube.




Adaptation - regeneration.


Arthropods

Arthropods

arthropod - an animal that has a jointed exoskeleton.

Crustaceans - lobsters and crabs

arachnids - spiders, ticks, and mites.

Insects - animals with six jointed legs.


Characteristics: the jointed part lets it move it's legs, the exoskeleton doesn't grow with the animal, every arthropod has legs, a digestive system, a circulatory system, and a brain, arthropods reproduce sexually.


Adaptations: have a hard shell


Mollusks

Mollusks

Mollusk - animal with a shell.

Example: snail.


Characteristics: soft body and no bones, mollusk means soft in Latin, most have hard shells to protect their body, the mollusk has a muscular foot.


Adaptations - has a shell.