How and why did sponges develop skeletons, given that they were the first animals, there were no predators when they evolved, and the available food for them was floating in the water
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How and why did sponges develop skeletons, given that they were the first animals, there were no predators when they evolved, and the available food for them was floating in the water?
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- Why are external skeletons important for soft-bodied invertebrates?What features of a hydrostatic skeleton do Sponges, Cnidarians, Nematodes, Annelids, and Arthropods each possess? and which features do they each lack?How does the foot of a bivalve differ from the foot of a cephalopod, or the foot of a snail? In what ways do these differences reflect specific adaptations for each animal to its unique lifestyle?
- The flexibility inherent in a segmented body plan was clearly important to crustacean evolution, but why are crustaceans so much more diverse than annelids, another segmented taxon?When and how did sponges develop their skeletons?How is the skeleton of a sea urchin like the skeleton of a lobster? How is it different? Sea stars have no teeth, yet they eat other animals (corals, molluscs). How do they do this?
- How does the arrangement of skeletal structures differ in sea urchins, sea stars, and brittle stars? How do these differences establish the way these animals move?In what ways is the dogfish skeleton not a good example of the primitive vertebrate condition?How does the arrangement of skeletal structures differ in sea urchins, sea stars, and brittle stars? How do these differences establish the way these animals move? How is the skeleton of a sea urchin like the skeleton of a lobster? How is it different? Sea stars have no teeth, yet they eat other animals (corals, molluscs). How do they do this?