Amoeba Proteus is a protistan found in ponds and streams. Itoften occurs on the undersides of plant leaves and amongdiatoms and desmids. Amoeba feeds on bacteria, smallalgae, and small protistan.
Scypha, sponges with a skeleton consisting ofmany small spicules made of cabonateembedded in a loose, jellylike matrix. ClassCalcarea
Aurelia is a common,widely distributedmarine medusa, or jellyfish. Large specimensmay reach 30 centimeters (12 inches) indiameter. Class Scyphozoa.
Ascaris lumbricoides is a large roundworm parasitefound in the humans. An estimated 25 percent ofthe world population is infected with this intestinalparasite. Adult female worms can reach 18 inchesin length (males are usually shorter).
Squid are large, swift-moving, and highlyspecialized moluscs. They exhibit a well-developed nervous system, complex senseorgans, and sophisticated patterns of behavior.
Earthworms are terrestrial annelids that typicallylive in tunnels they burrow in the soil. Internally,they demonstrate many features typical of theAnnelida, and they are the most commonlystudied representatives of the phylum.
Periplaneta americana is the largest of three mostcommon cockroaches in North America and Europe.It is called the American cockroach even though thespecies appears to have originated in Africa and wassubsequently introduced into all parts of the world.
Sea Cucumber are soft-bodied echinodermswith many tiny plates or ossicles embeddedwithin a leathery body wall. They aredorsoventrally elongated and lie on their sides.
Sharks, skates, rays, and chimaeras are ancientfishes with a cartilaginous endoskeleton, bitingjaws, paired appendages and a tough, leatheryskin that is usually covered with placoid scales.
Frogs are the most commonly studied representatives ofthe class Amphibian, Subphylum Vertebrata, PhylumChordata
The fetal pig is often chosen for study as arepresentative mammal because it containsorgans and organ systems typical of mostmammals.
Among the distinguishing features of mammals (Class Mammalian),are a body surface covered with hair, an integument (skin) withmammary and other types of glands, a skull with two occipitalcondyles , seven cervical (neck) vertebrae ,teeth borne on bony jaws,movable eyelids and fleshy external ears (pinnae), a four- chamberheart, a persistent left aorta, and a muscular diaphragm separatingthe thoracic anda abdominal cavities
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