Question

Provide a brief description/explanation about any of the 3 questions:

g) Metazoa vs. Eumetazoa

h) Problems with coral reefs today

i) Largest phylum in the clade Lophotroco

j) The largest phylum within the clade Ecdysozoa; the largest class within that.

k) The largest phylum within the clade Ecdysozoa; the largest class within that.

l) Open vs. closed circulatory systems; note several examples for each.

m) 2 major phyla within the clade Deuterostoma

Answer 1

g) Metazoa is from the division of the animal kingdom which comprises of all of the animals except the sponges and also the protozoa. The metazoa animals are multicellular. whereas the Eumetazoa belongs to the subkingdom of usually of the multicellular animals. The Eumetazoa has the true differentiated tissue which are form to get arrange in the germ layer. there are less complex tissue which are been present in metazoa whereas the eumetazoa contains the more complex tissue.

h) There are many problems that are been occuring with the coral reefs which leads to the degradation of the coral reefs. The degradation may be due to the temperature that gets increase in the seawater due to which the relation between the coral and the symbiotic microalgae may also get affected. As the algae is responsible for providing the bright color to the coral so due to the increase in the temperature of the seawater the coral may be white in color and may also get bleached. and due to which the coral reefs as well as the algae cannot able to recover.Also the other problems may include the overfishing also the pollution that are coming from the sewage as well as from the agriculture. these are the main reason in the degration of coral reefs.

l) In the closed circulatory system the blood have been closed in the vessel which are been of differenet size and also of the various different thickness whereas the the open circulatory has the mechanism of diffusing the blood into the hemocoel.In the open circulatory system the blood when pumped by the heart and get into the body cavity. Also in the closed circulatory system the flow of the blood is very high we can say at high velocity.whereas in the open circulatory system the flow of the blood is very low. In the closed circulatory system the interna organs cannot get in with the direct contact with the blood whereas in the open circulatory system the blood has the direct contact with the internal organ.So the closed circulatory system is present in human as well as in birds whereas the open circulatory system is present arthropoda and also in the insecta.