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Unit 18: Biology Part 1 Page 19 of 60
into their water vascular systems. phylum is
Some are filter feeders, while incredibly divers
others (such as starfish) are and the
predatory. They use this system in organisms
place of gills, heart, and a closed within it have
circulatory system. Although they developed numerous adaptations
do not have brains, they do have to deal with environments from
nerve nets responsible for your kitchen counter to the
receiving and processing sensory Amazon! Arthropoda is the largest
information. phylum in the animal kingdom.
Echinoderms are found worldwide, Examples of Arthropods include:
and play important roles in their scorpions, crabs and crayfish.
environments. Primarily, they are Arthropods are covered my hard
strong links in the food chain. For external skeletons. When they
example, they control the growth grow they shed these skeletons in
of algae on a process called molting.
coral reefs For gas exchange aquatic
(making it arthropods have gills, while
easier for the terrestrial (land-based)
reefs to filter- arthropods have either a tracheal
feed), and systems or book lungs. Tracheal
they serve as systems are air sacs fed by pores
food for other organisms (otters, in the exoskeleton. Book lungs are
for example). gills modified to extract oxygen
Arthropods (Phylum from air.
Arthropoda) Crustaceans
Arthropods, or organisms in the Six classes of crustaceans are
phylum arthropoda, are recognized in the
organisms with segmented bodies word, and almost
and appendages on at least one fifty two thousand
segment. They use these species. Most of
appendages for defense, feeding, them are aquatic.
sensory perception, and Interestingly,
locomotion. We usually see them they have a brain in the form of
everyday: fly on the wall, or ganglia (connections between
perhaps moth by the light. The nerve cells).
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