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Compare and contrast squids and clams in terms of following:
a. Body shape b. Skeleton c. Feeding structures d.locomotion e. Sense of organs f. Cephalization g. Habitat

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Irving Heathcote
Irving HeathcoteLv2
28 Sep 2019

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Related questions

1) What were the first animals like?

2) Compare the diversification of plants and animals. When do major body plans appear in these groups (for animals, think different phyla, and for plants, think algae/land plants/vascular plants/seed plants/angiosperms) and over how long a period of time do new plans appear)?

3) Why is bilateral symmetry strongly associated with cephalization, the concentration of the sense organs in an anterior ahead?

With reference to flatworms answer the following parts :

a.What are the best known representatives of the Platyhelminth phylum?

b. What is the main external morphological feature that differentiates platyhelminthes from other worms (nematodes)?

c.How many germ layers make up the body of platyhelminthes? How are they classified according to this feature?

d.What are the types of digestion and digestive system of platyhelminthes?

e.How are nutrients distributed by the digestive system in planaria?

f. How is gas exchange carried out in flatworms?

g.Poriferans and cnidarians do not have excretory systems. Do platyhelminthes have an excretory system?

h.What is an example of a freshwater flatworm? What physiological problem must these animals solve when living in that environment?

i.Is the nervous system of platyhelminthes more or less sophisticated than that of cnidarians1? What are the main neural structures found in flatworms? How is this neural organization important for the diversity of ecological niches explored by species of the phylum?

j.What is cephalization? How does lateral symmetry favor cephalization?

k.Do platyhelminthes use sexual or asexual reproduction?

l.How can asexual reproduction in planaria be described?

m.Are flatworms monoecious or dioecious?

n.Is it possible for a hermaphrodite species to carry out cross-fertilization?

o.What is direct development? Do planaria have a larval stage?

p.Into which classes are platyhelminthes divided? How can these classes be described and what are some representative species in each of them?

q.What are the main human diseases caused by platyhelminthes?

Hormones coordinate responses among many body tissues, which may seem unrelated. However, synchronizing the response in multiple tissues is highly adaptive. A) Give an example of one hormone that regulates different effects in different tissues/organs. B) For the example, mention what those effects are and where they take place. C) For one hormone, explain why it makes sense for to use the same hormone in order to regulate them.

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