Thymocytes that are not selected during Positive Selection: Group of answer choices are eliminated because of their reactivity with foreign antigens are most of the developing thymocytes and die by apoptosis in the thymic cortex are exported to the periphery, where they are phagocytosed by macrophages undergo genetic reprogramming and differentiate into a different cell type try out different beta-chains to acquire reactivity with self-MHC molecules

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.

it's anything that aren't producers and consumers.

explanation:

you've got to be clear on what "this" is

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.