Final answer:
Both calcium and potassium are considered major minerals that are necessary for the body. Calcium is stored in the skeleton and is important for bone health, while potassium is involved in the functioning of nerves and muscles.
Step-by-step explanation:
The major mineral elements considered important for the body are sodium, potassium, chloride, calcium, phosphorus, magnesium, and sulfur. Among the given options, both calcium and potassium are considered major minerals. Calcium is necessary for the hardening of bones and is stored in the skeleton, while potassium is needed for carrying electrical charges in nerves and muscles.