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A body plan in which the organs and tissues are arranged in a circle around a central axis.
A cylinder-shaped cnidarian that attaches to objects on the ocean bottom and remains sedentary.
Fang-like appendages near the mouth of an arachnid used to inject the prey with a paralyzing venom.
Appendages near the mouths of ticks, spiders, and other arachnids used to latch onto prey.
Any arthropod that has an elongated body composed of many segments, such as the centipede and millipede.
Bulb-like sacs in the echinoderm vascular system that are contracted to push the water through the canals into the foot.
A disease caused by microscopic parasites and transmitted through the bite of an infected Anopheles mosquito.
A disease caused by bacteria transmitted by the bite of a deer tick that causes muscle and joint aches.
Animals that are relocated from their native ecosystem to other parts of the world.
In some invertebrates, a structure made up of nerve cells; in mammals, a group of nerve cell bodies.
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