Certain mollusk shells can be much tougher than others, but are not extremely tough compared to many engineered materials. Why, then, are there attempts to mimic the toughening mechanisms at work in natural materials such as these?
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Certain mollusk shells can be much tougher than
others, but are not extremely tough compared to many
engineered materials. Why, then, are there attempts to mimic
the toughening mechanisms at work in natural materials
such as these?
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- Chitin is present in a number of invertebrates, as well as the fungi. What does this tell you about the origin and importance of this substance?Whereas the larvae of a particular species of marine crab are bright orange, the adults of the species are white. An expert on the crabs was asked, “Why are the two different life stages different in color?” She replied, “The larvae accumulate orange-colored carotenoid pigments, but the adults do not.” Did she recognize all the significant meanings in the question asked? Explain.How can egg of many marine animals survive long hours sitting exposed to the sun?
- Which of the following in sponges form the outermost epithelium-like layer that is in contact with the external, aquatic environment? a. Pinacocytes and choanocytes b. Pinacocytes only c. Choanocytes and collencytes d. Pinacocytes and collencytes e. Choanocytes only f. Collencytes onlyThe shells of molluscs have 3 layers. Which is not one (nacreous/mantle/periostracum)?For what reasons would a cell need a “skeleton”?