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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
how does the presence of exoskeleton explain the general small size of arthropodsas they have exoskeleton and periodic ecdysis the growth of
how do arthropods growbecause of the presence of exoskeleton the growth of an arthropod is periodical during the growth period the animal loses the
what is the external rigid carapace of arthropods called of which substance is it made which type of organic molecule is that substancethe external
what are the classes into which the phylum arthropoda is divided what are the three main ones and some of their representative speciesthe three major
what is the clitellum of earthtworms and where it is locatedthe clitellum is a special region of the annelid constituted by rings metameres with
how is the nervous system characterized in beings of the phylum annelida how can one compare cephalization in annelids to cephalization in nematodes