Question

I'm confused on this, please advise.

ANSWER the following about Porifera in general: 1. The mature form of this organism is sessile, what part of the life cycle moves? 2. What type of symmetry do these animals possess? 3. What characteristics classify these organisms as animals? 4. What is the evidence supporting animal evolution from a protist ancestor? Be sure to identify the protist ancestor and Supergroup of both the protist ancestor and animal group. 5. On the back of this sheet, draw and describe the general life cycle of sponges.

Answer 1

1. In the life cycle of porifera , amphiblastula larva is mobile because it has flagella.

2. The animal possess asymmetry because they are not divided into two equal halves.

3. Like other animals porifera absorb organic carbon rather than fixing it from inorganic sources such as carbon-dioxide. Their cells do not have cell wall. They produce sperm cells. That's why porifera is classified as animal.

4. The transition to multicellularity is the evidence which support the animal evolution from protist ancestor.

5.

develop into collar cells Flagellum. ae. Motile hallow sphere. Meiosis blastula. fertilized Zygote Amplublasteda. a larva TT ATT settled down Porifera life cycle