D) Methanogen is the awnser
<span>Continental plates pushing towards each other cause mountains to form on our planet Earth, true. </span>
I think the top three statements are the answer.
The answer is A. C and G go together and A and T go together.
This might have been the cause of not being exposed to this specific pollen during his years in Chicago. Allergic reactions can develop when the stimuli presented even when its not contagious causes the immune system to trigger and act in a defensive stance. This delayed effect may have been the cause of the sudden expression of the immune system.
