Can people die from the common cold

Place the steps tor the formation of the enzyme pepsinogen in correct order

Ineed to know why d is the correct answer asap

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