Amaterial that is not easily scratched is

Niobium forms a substitutional solid solution with vanadium. compute the number of niobium atoms per cubic centimeter for a niobium-vanadium alloy that contains 24 wt% nb and 76 wt% v. the densities of pure niobium and vanadium are 8.57 and 6.10 g/cm3, respectively

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

Describe the function of the endomembrane system? what organelles are involved?