Given a scientific question, generate a correct answer to it.

Input: Consider Input: What are female gonads normally called?

Output: ovaries

Input: Consider Input: Differences in density between water and air lead to differences in what?

Output: pressure

Input: Consider Input: Bromine is much less abundant than fluorine or chlorine, but it is easily recovered from seawater, which contains about 65 mg of br per what?
Output: liter