What other factors besides weather might influence the population growth of whooping cranes?

Availability of  food supply,  which is dependent on a prey supporting habitat. But the most serious factor is a safe nesting habitat. The whooping crane nests on the plains of Western Canada, and spent winters in Texas looking for food..

Heat flows in all directions.

The atoms near the candle absorb heat first.

Heat flows from the warmer atoms to the cooler atoms.

Explanation:

When a foil is exposed to heat by candle flame, heat reaches the foil in all directions. The flow of heat through the coil is usually by conduction, the actual transmission of heat from particle to particle.

When the foil is heated, atoms nearer the candle flame acquire more heat energy and this is gradually transferred to other cooler atoms in the foil until heat is now transmitted throughout the foil.