If I understand you correctly he cleans 4 tons every 2 years well 4 is double 2 so in 4 years he would have cleaned up 8 tons. They are trying to trick you with the larger number it has nothing to do with that big number.
I wanna say true because they have technology today to help figure out where its located or will most likely happen. I might not be right though.
Answer:
The first trilobite species went extinct and its ecological niche was occupied by another species, which may have evolved from the first cap
Explanation:
Considering the knowledge of geography and the situation you described in the text, the correct answer is that ", the Trilobite species went extinct and its ecological niche was occupied by another species, which may have evolved from the first cap.