The Periodic Table of the Elements is arranged so that elements with similar characteristics are in the same column. Which element is a highly reactive metal?
A: magnesium (Mg)

Which of the following questions is testable in a scientific investigation?
A: Are cats more active at night than during the day?.

New evidence suggests that "hot spots" may form in response to "twisting" stresses on plates. It is theorized that these stresses may eventually result in the splitting apart of the tectonic plate in the area of the hot spot. Which of the geographic features would be affected most by the splitting of a tectonic plate?
A: the Hawaiian Islands

In Florida, both panthers and bobcats prey on white-tailed deer. How will their competition for food most likely be affected if white-tailed deer populations in Florida suddenly decreases?
A:
Competition will increase between bobcats and panthers.