Which types of changes observe the law of conservation of mass?
a. only changes of state
b. only physical changes
c. only chemical changes
d. all of the above

14. many depressants reduce small muscle control, making it harder for a. you to steer b. your mind to consider complex problems c. the eye to scan, focus, or stay still d. the kidneys to filter alcohol out of the bloodstream

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by