What is the process by which bacteria convert nitrogen gas in the air to ammonia and nitrates which can then be used by plants?

Which of these has happened to your food by the time it reaches your small intestine? a. all the macromolecules have been broken down completely. b. lipids and starches have been partially broken down. c. starches and proteins have been partially broken down. d. proteins and lipids have been broken down into subunits.

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous

Which term most precisely describes the cellular process of breaking down large molecules into smaller ones? a) catalysis b) metabolism c) anabolism d) dehydration e) catabolism