Which of the following statements about mining is true? a. mining has no long-term effects on the earth. b. mining is unimportant to the economy. c. mining has no ecological impact. d. mining allows useful minerals to be extracted from the earth.

The correct answer is option D- Mining allows useful minerals to be extracted from the Earth.

Mining is defined as a process of digging and extract minerals and coal form their ores. It has economical as well as industrial benefits. Mining allows us to extract minerals from their ores so that we can bring them in our use to produce stuff beneficial for human and other creatures.  

For example, coal, lignite and uranium have a huge industrial use and benefit.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.