Q: If salt is added to a volume of water, there are more molecules in the same volume, so the water is denser.  Will removes salt from the pot of water. The water's volume is now less dense or denser?
A: less dense


Q: So more water is displaced by a bigger body than a smaller one.  Sally drops a bowling ball into a small wading pool, then she drops a much smaller baseball into the same wading pool. She notices that the baseball causes less water to splash out, this means that less water is displaced by the larger bowling ball or smaller baseball.?
A: smaller baseball.


Q: Low food supply or a lack of space can lower birth rates, increase death rates, or lead to emigration.  If there is more food in a place then more people will live there or die?
A: live there


Q: The Moon has a greater effect on the tides because, although it is much smaller than the Sun, it is much closer.  The Moon has more or less effect on the tides than Mars?
A: more