Answer:
Explanation: The reactivity of metals increases as you move left in a period and as you move down in a group, so Marie needs to know the period and group of the element inside each box. Boxes that show locations in groups 1 or 2 or in period 8 contain the most reactive elements.
Answer:
Interspecific competition is when different animals that live in the same geographic area (sympatric species) compete for the same set of resources, mostly food and space. ... This occurs when a species' survival or reproduction is suppressed because of the presence of a staunch competitor.