Question

question 3
the pronghorn is the second fastest mammal in the world. what is the most likely explanation for the pronghorns speed?
the wind created while running at high speed helps cool them down.
high speed allows them to migrate long distances between breeding grounds in the north and wintering grounds in the south.
they use their speed to outrun grizzly bears and cougars.
they used to be preyed upon by the american cheetah.

Explanation:

The pronghorn's speed is likely an evolutionary adaptation. In the past, when the American cheetah was present (now extinct), pronghorns needed speed to escape predation. This evolutionary pressure led to their high - speed ability. The other options are less likely explanations. While wind cooling (first option) is a minor physiological aspect, migration (second option) doesn't fully explain the extreme speed. And grizzly bears and cougars (third option) are not fast enough to be the main selective pressure for such high speed compared to the now - extinct American cheetah.

Answer:

They used to be preyed upon by the American cheetah.