8. both cardiac and skeletal muscle cells are
voluntary
false
true

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

Where substance is produced during cellular respiration

The part of the eye that closes and opens to let light in is .