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q define central nervous systemthe nervous system begins as a simple tube during embryonic development then anterior part expands and also ventricles
q what do you mean by nervous systemstructural organization cns pnsfunctional organization only concerned with pnssensory afferent -gt
q evolutionarily protochordates may be intermediate animals between invertebrates and vertebrates imagine a scientist is testing the hypothesis that
q 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 subphylumcephalochordates and urochordates or
q how do chordates reproducereproduction in beings of the phylum chordata is sexual with the exception of urochordates that can be also reproduce
q what is the group of the phylum chordata that first colonized the terrestrial environment from which habitat did they comepartially aquatic
q how can the tubular-dorsal nervous system in chordates be compared to the nervous pattern present in invertebratesin chordates the nervous system
q is the tubular-dorsal nervous system of chordates associated to radial or lateral symmetry how does that explain the complexity level of the
q what is the destination of the notochord in protochordates and in vertebratesin vertebrates the notochord disappears and gives birth to the spinal
q what is the destination of the branchial clefts in humansin humans the branchial clefts located in the anterior region of the pharynx also known as
q what are the three structures shared by every chordate that characterize the groupall beings of the phylum chordata have branchial clefts in the
q echinoderm identity card how are echinoderms characterized according to examples of representing beings basic morphology type of symmetry germ
q what are the classes into which the phylum echinodermata is dividedthe five echinoderm classes are asteroids starfishes ophiuroids crinoids
q is there a larval stage in echinodermsin echinoderms embryonic development is indirect with ciliated
q do echinoderms present external or internal fecundation is there sex division among individualsthe fecundation in echinoderms is external gametes
q how are the nervous and the symmetry system characterized in echinodermsadult echinoderms along with cnidarians are the animals that present radial
q do echinoderms have an excretory system how is excretion done in these animalsechinoderms do not have an excretory system their excretions are
q do echinoderms have circulatory and respiratory systemsin echinoderms there are not well- defined respiratory with the exception of the holothurian
q what is the embryonic characteristic that evolutionarily makes echinoderms proximal to chordateschordates and echinoderms are deuterostomes that is
q what is the kind of digestive system of echinodermsechinoderms present a complete digestive system with anus and mouthq do sea urchins have
q what is the system that permits fixation and movement to echinodermsthe system that permits fixation and movement to substrates in echinoderms is
q how can the endoskeleton of echinoderms be characterized in comparison to analogous structures present in vertebrates arthropods and molluscsthe
q what are the basic morphological features of echinodermsechinoderms as the name indicates derma skin echino spiny are creatures with spines
q under which environments do echinoderms liveechinoderms are marine animals and they live in salt