What do aquifers and reservoirs have in common?
A) They're both underground
B)They're both made of rock
C)They're both man-made
D)They're both filled with freshwater

The answer is they are both filled with fresh water

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Explanation:

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex