Answer:C. They must know the right time of year for gathering certain foods
Explanation:
I got it correct
<span> Rising, warm, moist air masses cool and release precipitation as they rise and then at high altitude, cool
and sink back to the surface as dry air masses after moving north or south of the tropics.
</span>
I hope this woll work.Best of luck.Sorry of the answer ia wrong
Because they have different density (density of feathers < density of nails)