1.
Tyler Milliron Period 5
Sea Star aka Starfish
http://en.wikipedia.org/wiki/File:Red- http://en.wikipedia.org/wiki/ http://en.wikipedia.org/wiki/
http://en.wikipedia.org/
knobbed.starfish.arp.jpg is site. File:White_Sea_StarFish,_Russia.jpg is site. File:Blue_starfish_in_Papua_New_Guinea.j
pg wiki/Seastar is the site.
Importance:
Their importance today is that they are used for food. Most common is their gonads,
which are eaten in Japan, Peru, and France. Also used for the replacement of lime in
places that can’t get real lime along with shellfish for farmers’ crops.
Their external transportation or moving The sea star gets its nutrition by feeding off
around is by central discs with usually five of mollusks; such as clams, oysters, snails,
arms. Then the water vascular system dying fish, or anything that it can attack and
brings in water, which moves to arms and won’t evade it. To get the prey out of its
provides suction. To get the suction it has shells that the mollusks are in is by the tube
tube feet; their arms have these tube feet feet pulling apart the shell and sucking out
and allow sea stars to stick on coral and the the insides with its mouth. It is a generalist
ocean floor to move. Sea stars only move if predator meaning it eats whatever it can
they are in danger, trying to catch prey, and and is not picky about its diet. There are two
if something in water is changing and gets stomachs for getting the nutrition; these are
scared. The tube feet work by the water cardiac and the pyloric stomachs. Then the
vascular system. This moves the tubes by water vascular system carries the protein
flexing and relaxing them to allow an action from place to place in body; also breaks
like suction cups; however the water down shells.
vascular system also moves the arms by
the channels that the tube feet come from. The sun star or also known as the sunflower
Their tube feet channels are in every arm is the oddball species of sea stars because
and then the tube feet stick out of the arms. it has more than five appendages;
The internal transportation is with is water therefore, it is the only one in the sea stars
vascular system and the circulatory system. like this. Also it ranges in the number of
They start in the center and work there way appendages.
out the arms in tubes and are in every arm.
There are three rings inside the sea star, Some adaptations are
which control what these systems do. • Grew spikes so harder to eat
• Radial symmetry which allowed
To tell what is going on around them and move freely
how they know what is going to happen is • External grooves on arms which
by the vibrations in water which is felt by made feeding easier.
tube feet, and their eyespot sees movement
by light changing.

2.
Tyler Milliron Period 5
Reproduction is either sexual or asexual they detach a limb and will then
asexual. This is because individual sea grow to a new independent body.
stars you can’t tell male and female. To There aren’t any extinct or endangered;
reproduce sexually they will release however, would have become extinct if
gametes and hope it is fertilized by not for different defense strategies. For
other gametes in opposite sex; example, they grew spines or spikes,
however, they also get in a big group of toxins in tube feet, sticky chemical
them and release chemicals to say realized to stop predators.
when ready then they spawn. To spawn
•Radial canal – part gets in class is by the
http://en.wikipedia.org/wiki/
File:P_helianthoides.jpg is the water vascular system spiny skin, internal
site for this picture. extends into each arm of skeleton, water vascular
starfish, ends small system, tube feet, and if
tentacles, help slide live in the sea. This
across ocean. class includes different
•Ring canal – moves species of sea urchins,
water from mouth sand dollars, brittle
to areas in the stars, sea cucumbers,
The general structure of body sea stars, sea lilies and
the sea star is that it has •Tube feet – act like feather stars. Also they
radial symmetry, two suction cups used for all have different uses
stomachs, endoskeleton locomotion and for there appendages.
plates, eyespot, grasping Sources:
madreporite, radial http://wiki.answers.com/Q/
canal, ring canal, The sea star breaths What_5_adaptations_does_the
using the water vascular _star7ish_help_it_survive
reproductive glands, http://www.dailykos.com/
tube feet, spiny skin, system which performs story/
internal skeleton, water a respiratory exchange 2006/10/20/201118/36
vascular system, between oxygen and http://wiki.answers.com/Q/
carbon dioxide using its How_do_tube_feet_help_echin
circulatory system. oderms_move
•Radial symmetry –body tube feet. The tube feet http://en.wikipedia.org/wiki/
parts repeat around act like gills and oxygen Sea_star
center of body enters them and carbon http://wiki.answers.com/Q/
dioxide exits. How_does_respiration_occur_i
•Endoskeleton plates – n_the_star7ish
plates that make up the Biology book
internal frame work The sea star is a second http://
•Eyespot – group cells order consumer; www.bio200.buffalo.edu/
therefore, it is a predator labs/star7ishpic.html
that detect changes in http://www.umanitoba.ca/
amount light in and prey. faculties/science/
environment biological_sciences/
•Madreporite – sieve like This class of labgloss.html
Echinodermata has http://
structure through which dictionary.reference.com/
water vascular system multiple different species browse/tube+feet?o=100074
of echinoderm opens to in it. The background http://en.wikipedia.org/wiki/
outside information on it to how Echinoderm