Are the trees EVERGREEN with needles arranged in clusters of 2-5? These are pine trees.

Are the trees EVERGREEN with needles arranged singly? 

Are the trees DECIDUOUS (shedding all leaves annually) with needles arranged in clusters of many on short, spur-like branches? These are larches.

Are the trees DECIDUOUS with needles of uneven length flattened along the twig. The cone a 1" diameter green or brown wrinkled ball? It is a baldcypress.