Nhận biết (M1)

Exclusively inhabiting tropical countries such as Tanzania, wild chimpanzees lack adaptation to seasonal variations in ultraviolet B (UVB) irradiance from sunlight, since UVB exposure enables vertebrates to synthesize vitamin D, this raises questions about how chimpanzees in mid-latitude zoos are affected by the lower and more variable UVB irradiance in those locations. In a study of zoo chimpanzees in France and other mid-latitude countries, Sophie Moittie and colleagues found not only that chimpanzees' vitamin D levels correlate with UVB irradiance but also that vitamin D levels show no evidence of plateauing as UVB irradiance reaches its highest local levels, suggesting that _______

Which choice most logically completes the text?

• A.

  adaptations to seasonal variations in UVB irradiance may be emerging in zoo chimpanzees in France and other mid-latitude countries.

• B.

  averaged across seasons, vitamin D levels in zoo chimpanzees in mid-latitude countries such as France tend to be comparable to those in wild chimpanzees in tropical countries such as Tanzania.

• C.

  providing supplemental vitamin D to chimpanzees in zoos in France and other mid-latitude countries would likely not be beneficial.

• D.

  zoo chimpanzees in France and other mid-latitude countries tend to synthesize less vitamin D than they are inherently capable of synthesizing.