clean air is of concern to most americans. the environmental protection agency (epa) has set forth guidelines for business,

industry, and private citizens to follow to improve air quality. all but one is a guideline of the epa to improve air quality.

that is

check and replace air filters regularly

reduce, reuse, and recycle whenever possible.

fix leaking faucets and minimize outdoor water use.

reduce the amount of particulate matter by limiting burning

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.

The reactions that occur in the ribosome, where amino acids are combined to form proteins are anabolic or catabolic?

Discuss the functions of epithelial connective nerviud and muscular tissues