Iron attaches oxygen to what in our bodies? a. muscles b. teeth and bone c. red blood cells

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat

One of the purposes of transcription is to produce a sequence of bases that

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen