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Sponge Body

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1) Discuss the basic body plan for organisms in phylum porifera. In your answer, be sure to also explain why sponges are considered multicellular organisms even though they do not have any tissues. You should also describe the key cell types that the sponges might possess, and explain the various modes of sponge reproduction. If poriferans possess any organs, you should also describe these organs and how they function. Finally, your answer should also include a discussion of the various taxonomic classes that exist in poriferans making sure to explain how each class is a modification of the basic sponge body plan. The basic body plan for an organisms in phylum porifera is realtively simple but very unique among other animals. The body …show more content…

In your answer, be sure to explain the concept of being diploblastic. You should also describe the key cell and tissue types that the cnidarians possess and modes of reproduction. If cnidarians possess any organs, you should also describe these organs and how they function. Finally, your answer should also include a discussion of the various taxonomic classes that exist in cnidarians making sure to explain how each class is a modification of the basic sponge body …show more content…

For example the group of flatworms, these are parasites which can often affect anything from the digestive tract to the brain canal. Often time a flatworm is passed by uncooked meats, and eggs can be transferred from not using proper hygiene. Once a worm has entered its host it is self-fertilizing. The worms can produce thousands of eggs and once passed from the host the egg remains in the digestive tract until it matures and the process can then re-start itself. This type of life cycle has caused many adaptations for the worms, for example the worms are self-fertilizing, this way one mature worm is all that is needed in a host organism. The worms are also segmented and they have hooks used for attachment inside the host. The worms also do not have a circulatory system they rely on gas exchange. (Encyclopedia Britannica, 2016).
5) In the Cnidarians, some organisms possess only a medusa form, some organisms possess on a polyp form, while others possess both a medusa and a poly form in their life cycle. Propose a hypothesis, either medusa first, or polyp first that could explain the evolution of cnidarian life cycles. From this, hypothesis identify which taxonomic class in cnidarian would be ancestral and explain why you think

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