B. thick atmosphere
You can also use quizlet to look up answers also, I'm in college and they have never failed me.
Answer:
I think the answer would be Nearest the major highway
Explanation:
The smallest thing they study is cells, i think!
hoped this helped!!
They show how all creatures have adapted such as giant dinosaurs are now tiny lizards =D<span />
Thomas could maybe look back through his day and see where he put them