How do the bats and the eagles forelimbs deffer

Bats wings are rubber and the eagles is feathers

Bat wings and bird wings are analogous as flight structures: their structure and function have evolved by different routes from a flightless reptilian ancestor. Note for example that a good portion of the flight surface in bats consists of a membrane stretched between the extended digits (chiropatagium), whereas the digits of the bird are relatively small and do not support the flight surface.

Ithink that the missing word is mixed

Developed countries will see a decrease in natural resources, because their population will decrease.