in mollusks, the muscle that holds the two shells of a bivalve together.
the structures in an earthworm that serve as "hearts"
a mollusk having two shells hinged together such as the clam
two paramecia exchange nuclear materials and then each cell goes under different diffisions. Then the offspring has genetic material from each cell.
any of a group of mollusks characterized by an indistinguishably merged head and foot, a beak and muscular tentacles, examples include the squid, octopus, and nautilus
the inner layer of cells lining the body cavity of a sponge
any of a group of marine animals with spines a calcium carbonate skeleton, a water vascular system and radial symmetry as adults, examples include starfish sea urchins and sand dollars
in a sponge the body opening through which water and waste materials flow out, same as osculum
the small pores in a sponge through which water enters
the tube in a mollusk through which water that has passed through the gills and /or digestive system is expelled from the body
the tube in a mollusk through which water is drawn into the mantle cavity for respiration and feeding
any of a group of mollusks characterized by only one shell: examples include, snails slugs whelks abalones conchs dowries and murexes.
a sporelike reproductive structure produced by a sponge that consists of a group of amoebocytes and spicules enclosed by a tough protective covering.
the larger of the two nuclei in ciliated prtozoa; serves to control the organisms basic activitis.
the smaller of the two nuclei in ciliated protozoa used in the reproduction.
a skinlike organ of mollusks which encloses the internal organs and, in most species, produces a calcium carbonate shell for protection
the open chamber of a mollusk in which the gills are located
in coelenterates and certain other invertebrates, a jellylike later of protein fibrils and sugars between the ectoderm and endoderm
any of a group of largely aquatic animals characterized by a muscular foot, a visceral hump, and a mantle; examples include clams snails and octopuses
an excretory tube found in earthworms and many other invertebrates
the opening of a sponge through which water passes out
a pair of fleshy lobes on each body segment of a sea worm used in movement and in the exchange of oxygen and carbon dioxide
able to develop without fertilization as the eggs seeds or spores of some insets algae and rotifers
the cell wall like structure that stiffens the body of a euglena
a tiny animal-like creature composed of a single- cell
a structure in the mouth of some mollusks (such as snails) that serves to tear up food and carry it into the moth. Resembles a conveyor belts studded with rows of teeth.
any of a group of microscopic invertebrates found in freshwater lakes and ponds, named for the wheel like movement of the cilia that often surrounds the moth
the head of a tapeworm, equipped with hooks and suckers to enable it to attach itself firmly to the wall of the hosts intestine.
bristlelike structures protruding from the side of an earthworm that aid in locomotion
needlelike structures made of calcium carbonate silica or other material that compose the skeleton of most sponges.
any of a group of spore forming protozoa characterized by a complex reproductive cycle that includes both asexual and sexual forms nearly all are parasites and are responsible for several diseases most notably malaria.
a dartlike structure embedded in the cortex of a ciliate that can be forcibly expelled for defense
same as gastropod
the boy region of a mollusk that contains the internal organs.
a complex system of water filled tubes that extends throughout the body of an echinoderm used for locomotion sensory perception feeding and respiration
in mollusks a muscular projection of the body that is often used for locomotion
sluglike marine gastropods noted for their brilliant colors and elaborate plumelike gills
a protective structure formed by certain bivalve mollusks consisting of thing sheets of nacre surrounding an irritating particle often used for jewelry
any of a group of gastropods that look like snail without shells
movable stalks tipped with suction cups found on the rays of starfish and certain other echinoderms
vast limestone formations built by the accumulation of coral
the free swimming umbrella shaped stage in the life cycle of a coelenterate
in zoology the sessile tube shaped stage in the life cycle of a coelenterate
a disease caused by filaria worms that block lymph vessels
asmall light sensitive structure found in many invertebrates and single celled creatures
a species of fluke in which the final host is commonly a sheep also known as the liver fluke
a helminthic disease of people caused by eating poorly cooked pork infested with trichina worms
hairlike projections from the cell membrane of some cells consisting of bundles of microtubules and motor proteins encased in a flexible membrane
an unusual type of movement among protozoa found onlly in the euglena in which the organism moves by alternately becoming rounded and elongated
a large movable whiplike tail that extends from a cell and is used for propulsion. Characteristics of euglenas dinoflagellates and sperm cells
the moth cavity of a paramecium
false foot, a temporary projection of a cell used for locomotion and for endocytosis. Characteristic of amoebas
any of a group of spore formin protozoa characterized by a complex reproductive cycle that includes both asexual and sexual forms, nearly all are parasites and are responsible for several diseases, most notably malaria
a trypanosoma that causes african sleeping sickness