Preventing the transfer of heat from an organims 's body causes that organism to keep warm.
Leaves keep animals warm.
Leaves are used by animals to stop transfer of heat from their body.
What might animals use leaves for?

[1] water conservation
[2] To make a path.
[3] To burn for warmth.
[4] storing water
[5] To keep their body heat.
[6] Help plants grow
[7] sunlight energy
[8] To fertilize gardens.