Corals need water where the average monthly temperature exceeds ________ Celsius throughout the year.
A) 18
B) 22
C) 26
D) 30
E) 34
Question 2
Research on PCBs concentration in coastal waters has documented that they are ________ compared to open-ocean concentrations.
A) 12 times less
B) 10 times less
C) double
D) 10 times more
E) 12 times more