The seven minerals the body needs in significant amounts to stay healthy are magnesium, phosphorus, chlorine, sulfur and

Answer : The seven minerals the body needs are, calcium, sodium, potassium, magnesium,  phosphorus, chlorine, and sulfur.

Explanation :

As we know that, the minerals, vitamins, water, proteins are important for our life or we can say that they play important role in our body.

Minerals : They are nutrients that our body needs in the small amount. Our body need seven types of minerals which are calcium, sodium, potassium, magnesium,  phosphorus, chlorine, and sulfur in significant amounts.

Vitamins : They are nutrients that are made from living things and they are also needed in small the amount.

As there are two types of vitamins that are fat-soluble vitamins and water- soluble vitamins. The fat-soluble vitamins dissolve in fatty materials and water- soluble vitamins dissolve in water.

As we know that the water is important for all life processes. Generally, all of the chemical reactions takes place in a water  solution.

Hence, the seven minerals the body needs are, calcium, sodium, potassium, magnesium,  phosphorus, chlorine, and sulfur.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."