(Q).
The upper rock layers are much younger.  Having read the above passage, choose the right answer to the following question (choices are older or younger ):   Sarah is looking at layers of rock on a cliff face. She can see that the rock at the very top of the cliff are older or younger?
(A).
younger


(Q).
The higher up a food chain that humans eat, the greater the levels of toxic metals they take in.  Having read the above passage, choose the right answer to the following question (choices are less or more ):   Mike is studying what humans eat. Bears are higher up the food chain than mosquitoes. Therefore, if humans were to eat mosquitoes, they would likely be taking in less or more levels of toxic metals?
(A).
less


(Q).
As the Universe expands, galaxies move further and further apart.  Having read the above passage, choose the right answer to the following question (choices are decreases or increases ):   When a city contracts the distance across the city decreases or increases?
(A).
decreases