Experimental technique: the use of parabiosis to evaluate hormone functioncoleman and his colleagues used a technique called parabiosis to evaluate if the products of the ob and db genes were involved in hormonal regulation of appetite and body fat. in parabiosis, two closely related animals are surgically joined from the shoulder to the pelvis. new capillaries grow between the two organisms, resulting in a shared circulatory system. however, not all compounds that circulate in the blood are exchanged between the two individuals. long-lived (slowly metabolized) compounds such as hormones are exchanged. short-lived (rapidly metabolized) compounds such as glucose and fatty acids are not exchanged. consider a db/db mutant and a wild-type mouse that will be joined by parabiosis. the db/db mutant has greatly elevated levels of both appetite-suppressing hormone and glucose because of its inability to suppress its appetite. in contrast, the wild-type mouse has normal levels of both hormone and glucose.

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !

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