When you suddenly travel to high altitude, you notice an unusual breathing pattern when you are resting. for a while you stop breathing completely; then suddenly you start breathing rapidly for a short time; then you stop breathing again. this can go on and on in a cyclical pattern called cheyne- stokes breathing. think in terms of the changes in partial pressure gradients when you go to high altitudes and explain how the breathing control system could produce this breathing pattern.

Mike was adopted, and his biological family history is unknown. although he is healthy, he would like some understanding of his genetic makeup, including potential health risks and genes that he could pass on to his children. mike has heard about commercial laboratories that can compare segments of your dna to those of people with common hereditary diseases in order to give you some idea of how susceptible you are to the diseases. the results of these types of tests are highly inconclusive. if mike's dna showed that he shares similarities in a segment of dna with people who have a given disease, his chances of developing that disease or passing it on to his children may be slightly elevated, but they are not 100 percent. these tests can cost more than $2,500 and are not covered by many insurance companies. do you think that mike should undergo the genetic tests? explain your answer. what are the potential pros and cons of having such tests done? describe how the availability of these genetic tests might affect the frequency of genetic diseases in individuals and populations.

Which of the following forest management practices is best for reestablishing areas of forest?

What are the pros and cons of quadrat sampling?