Which best explains why constantinople did not fall until 1453?

a. the city was well protected and repelled attacks by invaders.
b. the city created alliances with europeans to stop most attacks.
c. the city was far from byzantine territories and only attacked once.
d. the city created alliances with invaders to stop most attacks.

i believe it d) heterogeneous

monitor contract compliance and results of forestry activities to assure adherence to government regulations.  

plan and supervise forestry projects, such as determining the type, number and placement of trees to be planted, managing tree nurseries, thinning forest and monitoring growth of new seedlings.  

establish short- and long-term plans for management of forest lands and forest resources.  

determine methods of cutting and removing timber with minimum waste and environmental damage.  

supervise activities of other forestry workers.

by the way there is no video here.