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closed circulatory system
system in which blood moves through the body enclosed entirely in a series of blood vessels; provides an efficient means of gas exchange within the body
thin membrane that surrounds the internal organs of mollusks; in mollusks with shells, it secretes the shell
open circulatory system
system where blooc moves through vessels into open spaces around the body organs
in some snails and mollusks, the rasping, tonguelike organ used to drill, scrape, grate or cut food
sac with muscular walls and hard particles that grind soil before it passes into the intesting; common in birds and annelids such as earthworms
tiny bristles that help segmented worms move by anchoring their bodies in the soil so each segment can move the animal along
gas exchange system found in some arthropods where air-filled chambers have plates of folded membranes that increase the surface area of tissue exposed to the air
in arthropods, a visual system composed of multiple lenses; each lens registers light from a small portion of the field of view, creating an image composed of thousands of parts
in most arthropods, mouth parts adapted for holding, chewing, sucking, or biting various foods
in arthropods, tubules located in the abdomen that are attached to an empty waste into the intestine
type of asexual reproduction in which a new individual develops from an unfertilized egg
in arthropods, openings on the thorax and abdomen through which air enters and leaves the tracheal tubes
first pair of an arachnid's six pairs of appendages; located near the mouth, they are often modified into pincers or fangs
in insects, series of chemically-controlled changed in body structure from juvenile to adult; may be complete or incomplete
stage of incomplete metamorphosis where an insect hatching from an egg has the same general appearance as the adult insect but is smaller and sexually immature
second pair of an arachnids six pairs of appendages that are often adapted for handling food and sensing
stage of insect metamorphosis where tissues and organs are broken down and replaced by adult tissues; larvae emerges from pupa as a mature adult
in echinoderms, the sieve like, disk-shaped opening through which water flows in and out of the water vascular system; helps filter out large particles from entering the body
in echinoderms, hollow, thin-walled tubes that end in a suction cup; part of the water vascular system, they also aid in locomotion, gas exchange, and excretion
water vascular system
in echinoderms, the hydraulic system that operates under water pressure; aids in locomotion, gas exchange, and excretion
paired openings found behind the mouth of all chordates; in invertebrate chordates, they are used to strain food and water; in some vertebrates they are used for gas exhange and respiration
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