I posted the wikipedia yak article with pictures in the related links box below.
Yes.
In the winter days the yaks grow their coats in full but in the summer days they will shed most of it.
They are long-haired Yaks
Yes- they are hairy and have long hair.
To keep their Yak body warm.
The collective noun for 'yaks' a herd of yaks.
Wild Yaks and endangered, domestic Yaks are not threatened
no yaks are herbivorous
No Yaks in Alaska
Yaks do not have the movility in the steep hills. Yaks can not go where the goats roam.
Yaks are herbivores
Yes, yaks are mammals.