A mineral has a specific chemical composition true or false?

Which element provides strength to the exoskeleton of clams and oysters

Some mining processes involve removal of large areas of earths surface in the mined region this practice causes severe environmental damage by allowing which natural process to accelerate in the affected areas? a.precipitation b.erosion c.migration d.condensation

Vessels draining the myocardium of the heart, open primarily ,into which chamber?