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.

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

Which way do the nitrogenous bases in dna pair up? a. a and g; t and c b. a and c; t and g c. a and t; g and c d. a and a; t and t; g and g; c and c

On a recent expedition to a remote region of northern canada, scientists uncovered skeletal remains from about 100,000 years ago. surprisingly, all the skeletal remains, which included many species from differing biological families and spanned about two thousand years, showed evidence of experiencing temperatures in excess of 1000 degrees fahrenheit (or 538 degrees celsius). which of the following, if true, best explains the apparent paradox between the cold environment and the evidence of the bones experiencing hot temperatures? (a) chemical changes that naturally occur during the process of decay in only one north canadian species produce the same evidence of the species' skeletons being exposed to hot temperatures as the expedition scientists found. (b) a little over 103,000 years ago, a large fire is known to have occurred in northern canada. (c) strong evidence exists that as early as 70,000 years ago, homo sapiens around the world relied heavily on fire to cook animals. (d) in the same expedition and in roughly the same layer of excavation, scientists found rudimentary wood cutting and hunting tools used by early humans.