What evolutionary advancement does cnidarians show over Porifera?

What evolutionary advancement does cnidarians show over Porifera?

The major evolutionary step that occurred with the phylum cnidaria was the development of tissue-level organization. Recall that sponges exhibit cellular-level organization but have no true tissues. A tissue is an aggregation of similar cells that work together to carry out a specific function within the body.

What new developments do cnidarians have that poriferans do not?

Another feature that makes a Cnidarian more complex than an organism in the phylum Porifera is motility, Poriferans can not move, this makes it difficult to hunt prey which is why they use filter feeding to collect nutrients out of the water! Another way Cnidarians once again prove to be superior to Poriferans is they …

In what ways are the cnidarians more advanced than the poriferans?

Identify the common characteristics of phylum Cnidaria Cnidarians represent a more complex level of organization than Porifera. They possess outer and inner tissue layers that sandwich a noncellular mesoglea. Cnidarians possess a well-formed digestive system and carry out extracellular digestion.

How are cnidarians different from poriferans?

Cnidaria and porifera are two different phyla. Cnidarians have Cnidocytes but not the poriferans. Cnidarians have well-organized organ systems but not the poriferans; on the other hand, poriferans have an efficient tunnel system made up of pores but not the cnidarians.

What characteristics do cnidarians have that Poriferans do not have?

Poriferans do not possess true tissues, whereas cnidarians do have tissues. Because of this difference, poriferans do not have a nerve net or muscle cells for locomotion, which cnidarians have.

What characteristics do Poriferans and cnidarians share?

Porifera and Cnidaria are organisms which share similar characteristics with one another. -They are both multicellular, they consist of many cells working together. They are both eukaryotic, they have DNA in the form of chromosomes contained within a distinct nucleus.

What evolutionary advantages do members of the phylum Cnidaria have over members of the phylum Porifera?

Cnidarians represent a more complex level of organization than Porifera. They possess outer and inner tissue layers that sandwich a noncellular mesoglea between them. Cnidarians possess a well-formed digestive system and carry out extracellular digestion in a digestive cavity that extends through much of the animal.

What characteristics do cnidarians have that poriferans do not have?

How does the digestive process in cnidarians differ from sponges?

Sponges have multiple cell types that are geared toward executing various metabolic functions. Cnidarians have outer and inner tissue layers sandwiching a noncellular mesoglea. Cnidarians possess a well-formed digestive system and carry out extracellular digestion.

What other innovations do cnidarians have over sponges?

These organisms show a simple organization. Sponges have multiple cell types that are geared toward executing various metabolic functions. Cnidarians have outer and inner tissue layers sandwiching a noncellular mesoglea. Cnidarians possess a well-formed digestive system and carry out extracellular digestion.

Which is true about the evolution of the Cnidaria?

Among theories proposed on the evolution of the phylum Cnidaria, most treat the radial symmetry and tissue level of organization as evidence that the group is primitive (that is, it evolved before the evolution of bilateral symmetry) and hold that the medusa is the original body form, being the sexually reproductive phase…

How are Cnidaria and Porifera related to each other?

Only because Cnidaria and Porifera are phyla with small bodied organisms, it does not mean that they are closely related. Cnidarians and poriferans are mostly marine animals, but some are found in freshwater, as well.

What makes the phylum of Platyhelminthes more complex than the cnidarians?

What makes the phylum of Platyhelminthes more complex than the Cnidarians? Organisms in the phylum Platyhelminthes are triploblastic, this means they have 3 germ layers. This is a step up from the Cnidarians 2 germ layers, however they still have no coelom.

How does the mouth of a cnidarian work?

Mouth leads to coelenteron via stomodaeum that has ciliated troughs (siphonoglyphs) for water transport into and out of coelenteron. Coelenteron divided by radial mesenteries that extend inward and insert on the stomodaeum (complete mesenteries) or not (incomplete mesenteries).