(Q).
Bacteria with a mutation the helps resist antibiotics increase in numbers, so the mutation becomes more common.  Dana washes her hands a lot, so her bacteria has muted to help to resist antibiotics. As that bacteria increases in numbers, the mutation becomes common or rare?
(A).
common


(Q).
During inhalation, because the chest volume is larger, the air pressure inside the lungs is lower than the air pressure outside.  Will is inhaling and then he exhales. Which stage likely causes less air pressure in his lungs inhaling or exhaling?
(A).
inhaling


(Q).
The upper rock layers are much younger.  The archaeologist was digging and saw that the oldest rocks were in layers that were shallower or deeper?
(A).
deeper