What is the best long-term solution to maintain polar bear populations? a. introducing plants capable of bioremediation to the arctic
b. identifying new sources of fossil fuels around the world
c. replacing fossils fuels with renewable energy sources
d. establishing several protect regions in the arctic

Facilitated diffusion move large molecules and/or polar molecules across the cell membrane. what does facilitated diffusion use to do this?

Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.

Which body region are part of the cephalic region?