Diagram each nutrient, showing what happens from the time it enters your organism's mouth until the time it is used by your cell.

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.

1. which of the following transport mechanisms utilizes energy? a. osmosis b. diffusion c. facilitated diffusion d. endocytosis

This rapid change in species that rarely leaves behind fossil evidence is referred to as