The growth in the global ecological footprint since 1961 is largely a result of an increase in global carbon footprint. as fossil fuel combustion has increased, what subsequent change has resulted in the rise of our global carbon footprint?
a.) the land associated with fossil fuel reserves has decreased.
b.) the land required to produce alternative fuels has increased.
c.) the land required to assimilate co2 emissions has increased.
d.) the land required to offset o2 consumption has increased.

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.

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.