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it is fragile
Poachers and habitat destruction.
THey don't have corners
it was difficult because they had cleaned after themselves
they're difficult to see
A mansard roof is difficult to install due to its shape and structure. What makes a mansard roof so difficult to install is that there are 4 sides all of which have different slopes.
Because gravity keeps pulling you down, and the grease makes it difficult to use friction to overcome the pull of gravity.
Charles is difficult because he is disruptive and disrespectful in school, lies about his behavior, and influences the other students to act out. His behavior challenges the teacher's authority and disrupts the classroom environment.
The Nile isn't. That's why civilization took off there.
it doesn't, in fact it makes it harder. Inertia resists change, so it makes it a bit difficult to get the bike moving.
It damages the pleasure centers in the brain and makes it so that the amount a normal amount of pleasure can only be acheived by doing more of the drug.
because its such a big country