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In: Biology

Question 11 11-Which is of the following is the most basal group within Metazoa? Group of...

Question 11

11-Which is of the following is the most basal group within Metazoa?

Group of answer choices

1-porifera

2-cnidaria

3-ctenophora

4-choanoflagellates

Question 12

12-If you were told an organism is a pseudocoelomate, what else could you say with confidence about the animal?

Group of answer choices

1-the animal is triploblastic

2-it could belong to the subphylum vertebrata

3-it does not belong within the Eumetazoa

4-it does not belong to the lophotrochozoa

Expert Solution

11 choanozoa gave rise to sponges which are the most primitive matazoa .unlike other metazoa sponges do not have muscles or nerves . metazoa are multicellular organisms which comes under phylum coelentrates ,echinoderms ,molluscs, vertebrates and articulate in phylogenetic relation porifera is the basic group of metazoa ,then comes placozoa then cnidaria and then ctenophora .basal metazoa is porifera .

12 pseudocoloemate is any invertebrate animal whose body cavity is a pseudocoel ,a cavity between the gut and outer body wall derived from a persistant blastocoel rather than a true coloem

nematodes acanthocephalans ,kinorhynchs ,nematomorphs are pseudocoloemate

body cavity of any sort only exist in triploblastic animals . pseudocoloemates have body cavity but not lined with mesodermal cell .it is in between mesoderm and endoderm

pseudocoelomates belong to invertebrates

eumetazoans include tru tissue organized in to germlayers and an embryo that goes through gastrula stage .they are diploblast ,sister group of prolifera basal eumetazoan are ctenophora

lophotrochozoa include members of annelids ,platyhelminthes ,molluscs ,nematodes

can say confidently that it does not belong to eumetazoa

gladiator answered 2 years ago

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