I am pretty sure it is CD4 cell
The flooding of half part of the forest have successful separate the population of frogs in that ecosystem into two different set of frogs. This is an example of allopatric speciation, that is, the population become separated as a result of geographical barrier. This separation will make the two set of frog population to become new species. On the long run, the two species may become unable to relate sexually.
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It's C. Plants produce oxygen and nutrients via a process known as photosynthesis using water and carbon dioxide
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Thus the air temperature is highest near the surface and decreases as altitude increases. ... Therefore, air pressure decreases as we increase altitude. The air density depends on both the temperature and the pressure through the equation of state and also decreases with increasing altitude.
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