Well first you have to know the that between hair and fur, they are merely the same thing. The hair length/type (and all that jazz) of the animal depends on the parents genetic DNA that is passed on to the offspring.
A. "howls" is correct. These can be confusing, because if it were just "wolves" it would be "howl", but since it's a "pack", which is singular, it's "howls". Try saying it out loud.
I cannot see which is italicized so I will say which one is cause and which one is effect: The effect is that the cookies in the oven became charcoal. The cause of why the cookies became charcoal is that 'David left the cookies in the oven too long.'
Answer:
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