Because of the soil the rocks are in. If They stayed in that soil for a while which affected the compounds, shifting the mineral composition.
The answer is actually "to prepare for special medical needs' I took the test
Explanation:
The arteries (red) carry oxygen and nutrients away from your heart, to your body's tissues. The veins (blue) take oxygen-poor blood back to the heart. Arteries begin with the aorta, the large artery leaving the heart. They carry oxygen-rich blood away from the heart to all of the body's tissues.
Water conservation involves protecting the animals