Explanation should include 

o    light 
o    water availability 
o    nutrient availability
o    topography
o    soils
o    aspect (i.e., direction of slope face)
o    climate
o    natural disturbances (e.g., lightning, fire, flood)
o    competition
o    disease susceptibility
o    anthropogenic factors (e.g., logging, farming, mining) 
o    the influence of plants, animals, fungi, and bacteria
o    the effects from forest pests (e.g., emerald ash borer, southern pine beetle, spotted lanternfly) 
o    mycorrhiza.

Process/Skill Questions: