Aresearcher notices a decline in organism and population numbers over several years in a stream environment. what human activity may have affected organisms and populations in this way?

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.