Tardigrade
Tardigrade (water bear) (Echiniscus spp.). Tardigrada is an obscure phylum of invertebrates located between the nematodes (roundworms) and the arthropods (crustacea, insects, and ticks). Tardigrades are microscopic aquatic animals that need water to live. Without water they shrivel into a cask stage and survive long periods of desiccation in a stage called cryptobiosis. Cryptobiosis is of great interest in the study of cryogenics. Water bears feed on the fluids of plant and animals cells.
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Spider Silk Spinnerets
Silk-secreting spinneret spigots on a spiny-backed spider (Gasteracantha spp.). Spider web silk is extruded from three pairs of organs called spinnerets that are located on a spider's abdomen. Spinnerets move independently yet in a highly coordinated manner to build cocoons or webs. Each spinneret is dotted with many tiny spigots through which various types and thickness of silk are extruded. The strength of some silk exceeds that of steel and its toughness exceeds that of kevlar. It is considered to be a natural, high performance polymer.
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Fungus
Acellular slime mold (Lamproderma spp.) reproductive fruiting structure arising from the plasmodium. The plasmodium is the vegetative organism that is a glistening, vein-like, slimy material that travels on surfaces and engulfs food; growing as it moves. There are no cell walls in the plasmodium, and its motion is the result of protoplasm flowing rhythmically through the organism. When it runs out of food it converts itelf into sporangia or spore balls (above).
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Hydra
This cnidarian (Hydra spp.) is a tiny (3 to 8mm) aquatic invertegrate in the phylum Cnidaria. Cnidarians have two principla body forms: a polyp stage and a medusa stage. Thy are characterized by their mouths, which are generally surrounde by tentacles. In many species, unique sting cells called mematocysts are contained in thentacle epiderml tissue. Many thousands of cnidarian species live in the world's oceans, from the tropics to the poles, from the surfact to the bottom. Hydra spp. occur predominatly in fresh water habitats.
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