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- Crayfish Describe the functions of the parts of the crayfish. What are the ecology and economic biology of the crayfish?Cetaceans give birth to few well-developed calves at well-spaced intervals. They also feed and protect the calves for long periods. This is insharp contrast to most fishes, in which many eggs are spawned and theparents spend no time feeding and protecting the offspring. What do youthink is the best strategy? Has this strategy paid off in the great whales?A) what is the scientific name of the shell and its common name B) what does the shells species eats and what feeding method it uses to obtain its food (filter feeder, active predator, active herbivore, etc).
- The Barton Springs salamander is an endangered species found only inthree adjacent springs in the city of Austin, Texas. There is growingconcern that a chemical spill on a nearby freeway could pollute thespring and wipe out the species. To provide a source of salamanders torepopulate the spring in the event of such a catastrophe, a proposal hasbeen made to establish a captive breeding population of the salamanderin a local zoo. You are asked to provide a plan for the establishment ofthis captive breeding population, with the goal of maintaining as muchof the genetic variation of the species as possible. What factors mightcause loss of genetic variation in the establishment of the captivepopulation? How could loss of such variation be prevented? With theassumption that only a limited number of salamanders can bemaintained in captivity, what procedures should be instituted to ensurethe long-term maintenance of as much variation as possible?referring to Figure 1.20, provide a possible explanationfor how, over a very long time, the green warbler finchcame to have a slender beak.Which is the type ofnitrogen waste birds produce?Why does this feature, besidesbeing an adaptation to theterrestrial environment, alsomean an adaptation to flight?
- In various species of reef fishes, sex reversal is commonly associated with the animal’s _____. A) Scales B) Eye colour C) Size D) AgeWhy I the hatching success and mortality of barnacles under laboratory conditions important for ecosystem sustainability.Explain how ocean acidification is likely to affect molluscs. Describe the long-term effects of this process on human economies.
- How humans learn and remember things is still one of the major unsolvedbiological mysteries. Much of what is currently understood about learning andmemory and the biological basis of behaviour comes from the study ofinvertebrates, including the gastropod molluscs. Describe the types ofexperiments that have been performed on gastropods and the extent to whicheach has increased our understanding of how animals learn.. How might we and other species be affected if mostor all amphibians (Core Case Study) were to goextinct?Describe how these ungulates (hoofed mammals) might affect ONE of the following the bird's habitat