What do cats and humans have in common

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

When are the centromeres broken in meiosis?

The backbone of the double helix has an alternating molecules. what do you call these alternating molecule?