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Trochophore larvae are characteristic of (a) arthropods (b) cnidarians (c)
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- If nematodes are the most numerous animals, the Arthropoda, including insects, are the most diverse, accounting for more than half of all known animal species. What features have led to the remarkable evolutionary success of this branch?Closest to Chordata 1. Echinodermata2. Platyhelminthes3. Annelida4. Porifera5. Chordata6. Arthropoda7. Nematods8. Cnidaria9. MolluscaWhich phylum do you belong to? 1. Echinodermata2. Platyhelminthes3. Annelida4. Porifera5. Chordata6. Arthropoda7. Nematods8. Cnidaria9. Mollusca
- How does segmentation and having a fluid-filled body cavity confer certain advantages to annelids over the other worm phyla such as flatworms and nematodes?Define adaptation. How could you use a comparative approach to test whether mesoglea within a scyphozoan medusa was an adaptation for buoyancy? How could you use a different criterion to test whether the eyes of cubozoans were adaptive? Where would a comparative approach prove a better way to assess the adaptive values of a tegument in internal parasites: in tapeworms or nematodes? Why?Why is Ammocoete Larvae important in the story of evolution? What does its anatomy shed light on?
- by comparing and contrasting the physical features of a shark, guitar fish and the sting ray, what can you deduce about the evolutionary relationships among the elasmobranchs?1) Are Lepidosaurs and Archosaurs are monophylum? 2) What are tunicates? Are they vertebrates? Are they chordates? If so, how do we know? How do tunicates feed as adults?What evolutionary adaption has enable Arthropods to be the most diverse group within the animal kingdom?
- From an evolutionary perspective, what is the significance of each of the following: (1) placoderms, (2) lungfishes, (3) ray-finned fishes, and (4) Tiktaalik?⮚ Given what you already know about tardigrades, would you agree that they are the toughest animals? Why or why not? ⮚ How are tardigrades able to survive in harsh conditions? ⮚ How is the biology of onychophorans related to their distribution? ⮚ What do you think is the trade – off, if any, during prey capture of velvet worms?What is the external rigid carapace of arthropods called? Of which substance is it made? Which type of organic molecule is that substance?