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how does the swim bladder of fishes work allowing fishes to control their depth under waterfrom hydrostatics it is called that an object does not
how dissimilar are the swimming strategies in osteichthyes and in chondrichthyes why do sharks need to agitate their body to swim while bony fishes
comparing to cyclostomes primitive vertebrates what are the main novelties presented by fishescompared to cyclostomes evolutionary novelties shown by
what are the major features of fishes associated to the habitat where they livefishes are all aquatic animals and therefore they have a hydrodynamic
what are the two main classes into which fishes are dividedfishes are separated into two main classes chondrichthyes fishes with cartilaginous
what are the six criteria used to build a complete evolutionary branch of vertebratesdichotomy in each of the six following criteria builds the
into which subphyla are the protochordates divided what are some representatives of each protochordate subphylumurochordates or tunicates and
what is the group of the phylum chordata that first colonized the terrestrial environment from which habitat did they comeamphibians partially
what is the destination of the branchial clefts in humansin humans the branchial clefts situated in the anterior region of the pharynx also called as
normal 0 false false false en-in x-none x-none microsoftinternetexplorer4 what are the two main subdivisions of the
do echinoderms present internal or external fecundation is there sex division among individualsthe fecundation in echinoderms is external gametes are
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