What are the defining characteristics of Mollusca (including tissue, nervous system, circulatory system, respiratory, larvae)? State -3 defining characteristics for all Classes of Mollusca and an example of each?

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Nestor RutherfordLv2

28 Sep 2019

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1) While the shell is a good defensive strategy, it also carries certain costs/problems. Identify at least one of these problems and briefly discuss how this phylum (Mollusca) has overcome this issue?

2) Define convergent evolution, and discuss how the cephalopodsâ eye and the vertebratesâ eye demonstrate this phenomenon.

3) If you were an engineer hired to design an artiï¬cial eye, would you base your model on the eye of the mammal or on that of the squid? Explain your decision

4) How does the circulatory system viewed in the squid differ from that viewed in other molluscs? What advantage does this confer? What route does blood follow as it moves through the squid? Start at the systemic heart.

5) Describe the route that water follows as it passes through a clam starting from the incurrent siphon and finishing with the excurrent siphon

6) What is adaptive radiation? Identify two examples of adaptive radiation that you observed in lab today. Be specific and speculation on the advantages conferred in each example.

7) Members of such a large and diverse phylum as Mollusca impact humans in many ways. Discuss this statement. 500 words max.

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1) How does the circulatory system viewed in the squid differ from that viewed in other molluscs? What advantage does this confer? What route does blood follow as it moves through the squid? Start at the systemic heart.

2) Describe the route that water follows as it passes through a clam starting from the incurrent siphon and finishing with the excurrent siphon

3) What is adaptive radiation? Identify two examples of adaptive radiation that you observed in lab today. Be specific and speculation on the advantages conferred in each example.

4) Members of such a large and diverse phylum as Mollusca impact humans in many ways. Discuss this statement. 500 words max.