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A set of soft overlapping flaps, covered up by a plate on the abdomen, through which oxygen is taken up and carbon dioxide given off. Characteristic of many terrestrial arachnids such as scorpions and spiders.
Industry:Biology
Fluid which circulates throughout the body of an animal, distributing nutrients, and often oxygen as well.
Industry:Biology
Arthropod appendages that are biramous have two branches, an outer branch and an inner branch. These branches may have separate functions; in crustaceans, for instance, the inner branch of a leg is used for walking, while the outer branch may be paddle-shaped or feathery and often functions as a gill. Contrast with uniramous.
Industry:Biology
A vertebrate distinguished by a skull with no openings in the side behind the eyes, e.g. turtles.
Industry:Biology
End of the digestive tract, or gut, through which waste products of digestion are excreted, as distinct from the mouth.
Industry:Biology
An egg that can be laid on land due to the presence of a fluid-filled amniotic sac (amnion) that cushions and protects the developing embryo. amniote - n. Any of a group of land-dwelling vertebrates that have an amnion during embryonic development, including reptiles, birds, and mammals. Most extant mammals give live birth, the egg being retained inside the body during gestation.
Industry:Biology
Depositi cristallini o minerali trovati in spugne, tunicati o cetrioli di mare. Sono componenti strutturali in molte spugne e può servire una funzione protettiva in altri organismi.
Industry:Biology
In insetti e alcuni altri artropodi terrestri, una piccola apertura attraverso la quale aria si tenga le trachee. Gli insetti hanno parecchi spiracoli, disposti lungo i lati dell'addome.
Industry:Biology
