Aperson’s skin cells and heart cells both have a complete copy of all of the person’s chromosomes. each cell, however, makes different types of proteins to perform its function. what is the source of the instructions from which all of the proteins are made? a. genes b. mitochondria c. gametes d. cell membrane

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