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how are the symmetry and the nervous system characterized in echinodermsadult echinoderms with cnidarians are the animals that present radial
do sea urchins have teethsea urchins have a teeth-like structure juxtaposed to the mouth and made of five teeth linked to ossicles and muscle fibers
what is the system that permits movement and fixation to echinodermsthe system that allows movement and fixation to substrates in echinoderms is
what are examples of the ecological and economic importance of molluscsmolluscs are significant players in several food chains in ecosystems many
how is the nervous system of molluscs organizedmolluscs have well-developed sensory structures it is established that cephalopods such as squid and
what is the function of the feet in molluscs how is the mollusc foot related to the name given to the classes of the phylumthe mollusc foot has the
do octopus and squids have exoskeletonoctopus and squids normally do not produce external shell some squid species can have an internal shell one
how is the large size of some cephalopods related to the type of circulatory system they present in cephalopods the circulatory system is closed and
how is the respiratory system in aquatic molluscs divided what adaptive respiratory structure do terrestrial molluscs presentaquatic molluscs
what is the radula what is the function of this organ some molluscs have a tongue-like structure with harsh saliences similar to small teeth this
how is the body of gastropods dividedthe body of gastropods is separated into three main portionsa headb the visceral mass andc
into which classes are mollusc divided what are some representing beings of each classthe phylum mollusca is separated into five major classes
are mollusc metameric beings exclusively analyzing this feature could it be said that molluscs are evolutionarily proximal to nematodes or to
what are the biological troubles that molluscs face due to their soft bodybecause molluscs have a soft body they are more fragile they also have more
how are the three main arthropod classes characterized according to the body divisionin crustaceans and arachnids the head is fused with the thorax
is the stage when an insect larva is within a cocoon a stage of total biological inactivitythe period when the larva is inside its cocoon is a time
what are nymph and imagonymphs are larvae of hemimetabolic insects like grasshoppers they are very same to the adult insect although smaller in
how are the main classes of arthropods classified according to the presence of larval stage in their embryonic developmentin crustaceans there are
what are compound eyesarthropods have compound eyes made of many visual units called ommatidia every ommatidium transmits visual information by the
what are the noteworthy features of the nervous system of arthropodsin arthropods the nervous system has more complicated sensory receptors with
how are the excretory systems of the three main arthropod classes constitutedin crustaceans a pair of excretory organs known as green glands exists
what are respiratory pigments what is the respiratory pigment present in some arthropods which is the analogous molecule in humans respiratory
what is the type of circulatory system present in arthropods do these animals have heart and respiratory pigments in arthropods the respiratory
in arthropods why isnt gas exchange done through cutaneous diffusionin arthropods the impermeability of the exoskeleton makes the passage of gases
what is the type of digestive system present in beings of the phylum arthropoda are these animals protostomes or deuterostomesthe digestive tube of