I would say maybe natural materials such as copper, gold, and diamonds, because they all come from the ground
I think the answer is that it will be difficult to identify it by Exercise Tolerance Test (ETT). This test records the electrical activity of the heart while you exercise. It is used to identify rhythm abnormalities when exercising in people who experience chest pain.
Las letras son A, C, G y T, que simbolizan las cuatro subunidades de nucleótidos de una banda ADN - adenina, citosina, guanina, timina, que son bases covalentemente ligadas a cadenas fosfóricas.
1.adenina,
2.citosina,
3.guanina,
4.timina,