What makes a rock an ore? a. it has to contain metal. b. it has to be igneous in origin. c. it has to be able to be mined economically. d. it has to be able to be dug out of the ground.

the answer is C. an ore quote: is an occurrence of rock or sediment that contains sufficient minerals with economically important elements. hope this helps!

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".

i'm wiling to try and you : )