() the northern portion of canada is covered by boreal forests, which are characterized by
a. replanted rows of oak trees.
b. thickly grown rain forests.
c. dense coverings of pine trees.
d. sparsely placed deciduous trees.

I believe the answer is: c. dense coverings of pine trees.

Boreal forest usually located near the area that is covered by snow, and  consisting mostly of pines, spruces and larches. This type of forrest  is very common to be found in areas with naturally colder climate such as northern canada and alaska.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).