The best use of the food pyramid would be
a. to determine a healthy eating pattern that represents a balanced diet
b. to determine the food that should never be eaten
c. to create a diet that excludes fat
d. to count calories and carbohydrates

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:

the median of the data is 4.5.