A company must perform a maintenance project consisting of seven activities. The activities, their predecessors, and their respective time estimates are presented here: 
Using CPM, which activities make up the critical path?
Definitions:
Water Resources
Sources of water that are useful or potentially useful to humans, including rivers, lakes, aquifers, and freshwater wetlands.
Animals
Refers to multicellular, eukaryotic organisms in the kingdom Animalia that typically have the ability to move and consume organic material.
Marginal Analysis
An examination of the additional benefits of an activity compared to the additional costs incurred by that same activity.
Insignificant Benefits
Benefits or advantages that are too small or unimportant to make a noticeable difference.
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