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are nematodes exclusively parasites there are parasitic roundworms containing parasites of plants but there are also free-living
what are examples of nematodesascaris hookworm and filaria all parasites of humans are instance of nematodes also called as
is it possible for a hermaphrodite species to present cross-fecundationthere are hermaphrodite species of animals and plants that present
how can asexual reproduction in planarias be describedplanarias can separate themselves asexually by transversal bipartition because of the great
is the nervous system in platyhelminthes more or less sophisticated than in cnidarians what are the main neural structures found in flatworms how is
poriferans and cnidarians do not have excretory systems do platyhelminthes have an excretory systemplatyhelminthes have a primitive excretory system
how is gas exchange done in flatwormsplatyhelminthes exchange gases exclusively by diffusion by their body surface this is only possible because all
what are the types of digestion and of digestive system of platyhelminthesflatworms have incomplete digestive systems and they show intracellular and
what is the main external morphological feature that differentiates platyhelminthes from other worms nematodesplatyhelminthes are also called as
what are the best known representatives of the platyhelminth phylumthe most popular representatives of the platyhelminthes are worms that cause human
what does radial symmetry mean what is the type of symmetry found in chordates which are other phyla of the animal kingdom that present species with
what are the main classes into which the phylum is divided what are some examples of each and in which form polyp or medusae are they
what is the name of the larva of corals and sea anemones what is the biological significance of that larval stage sexual reproduction in corals and
in the metagenesis of aurelia and obelia what is the form that produces gametes what is the form that reproduces asexuallyin the metagenesis of some
what is metagenesis what are the other names of this processmetagenesis is the type of life cycle in which there are two dissimilar forms of
what are cnidocytes what is the name of the capsule inside the cnidocyte what are the biological functions of this structurecnidocytes are
what is the type of digestion that occurs in cnidariansthese animals have a digestive cavity and they make intracellular and extracellular digestion
which are the germ layers present in cnidarians which tissues of the animal do they originatethese beings there ectoderm and endoderm two germ layers
concerning tissue complexity how different are cnidarians from poriferanscnidarians have true tissue differentiation they present separate organized
what are the two main morphological patterns of cnidarians concerning locomotion how do these forms differentiate from each othermorphologically
what is the evolutionary advantage of the occurrence of sperm cells and larval stage in the life cycle of spongesthe sexual reproduction in sponges
how are gases exchanged in spongesthe gas exchange in sponges occurs by diffusion from the external to the cells that absorb molecular oxygen and
concerning digestion how are poriferans characterizedsponges are dissimilar from other animals since they present only intracellular digestionthey do
what are the main cells of which poriferans are madesponges have their outer wall covered by flat cells known as pinacocytes and having pores
how do sponges try to protect themselves against harm from the environment is that method efficient or rudimentarysponges can close their pores to