Worldwide, too little iodine in the diet is the most common cause of hypothyroidism. In countries with enough iodine in the diet, the most common cause of hypothyroidism is the autoimmune condition Hashimoto's thyroiditis.
The pronghorn is the second fastest land mammal in the world, after the cheetah. It can attain speeds of over 53 miles (86 kilometers) per hour. Size relative to a 6-ft (2-m) man: Fleet-footed pronghorns are among the speediest animals in North America. They can run at more than 53 miles (86 kilometers) an hour, leaving pursuing coyotes and bobcats in the dust.
If a lion  ran 100 yards at 40 miles per hour, it wâ¦ould take him 5.114  seconds. If he could sustain 50 miles per hour the whole way, it  would only take him 4.091    seconds.   The lion cannot run that fast, 35 mph is the top speed for lions. 1 person found this useful.