Which of the following systems helps get rid of some kind of waste? A
excretory system
B
digestive system
C
respiratory system
D
all of the above

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

Achemical reaction is done in the setup shown, resulting in a change of mass. what will happen if the same reaction is done in a sealed container that is placed on the electronic balance?

Which would freeze at a higher temperature: the great salt lake or lake tahoe? a. lake tahoe would freeze at a higher temperature. b. the great salt lake would freeze at a higher temperature. c. both lakes would freeze at the same temperature.