A log is reduced to a small pile of ash when it burns. explain the difference in mass between the log and the ash. 99 points

What did hunter gathers do to alter the environment?

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

With regard to enzymes, key is to lock as a) substrate is to activation energy eliminate b) product is to substrate. c) enzyme is to active site. d) substrate is to active site.