A dichotomous key is used to and you always start with ? Help you find your way through an unknown area; #1

Help you identify an unknown organism; #2

Help you solve a riddle; #2

Help you identify an unknown organism; #1

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.

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer

Which particle controls what element an atom is?