Question

A *reactive metal* whose compounds make up *limestones, chalk, cement, and the bones and teeth of animals.* Milk is a good nutritional source of this element.

Answer 1

Calcium is a reactive metal that is present in compounds like limestones and the bones and teeth of animals. Milk is a good source of calcium.

Step-by-step explanation:

The subject of this question is Biology. The compounds mentioned, such as limestones, chalk, cement, and the bones and teeth of animals, contain a reactive metal. This reactive metal is calcium. Milk is a good nutritional source of this element because it is rich in calcium.