Pushing a chair requires less energy than pushing than pushing a desk because A. The surface area of the desk is larger.

B. The desk has less mass then then the chair

C. The chair has less mass then the desk

D. The chair is smaller

c

the chair has less mass then the desk

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation: