Which of the following statements regarding mechanisms leading to T cell receptor diversity is TRUE?

Other than nitrogen removed via harvest of plant and animal product, the main loss pathways of N from agroecosystems are:

A pharmaceutical company has developed a drug that blocks the function of the neonatal Fc receptor.  Which of the following will be the MOST LIKELY effect of administering this drug? 

To stimulate soil organic carbon accumulation over the years, an ecosystem must

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How many years ago did grasses emerge? 

How many years ago did grasslands emerge?

Hadley cells drive precipitation gradients on a [answer1] and the orographic effect drives precipitation gradients on a [answer2]. 

If you were given an annual temperature of 9 C and an annual precipitation of 1000 mm as well as land management involving regular prescribed burns and grazing, which biome would you predict to find under those conditions? 

What has been the biggest driver of the loss of North American grasslands?