What is the difference between direct and indirect restorative materials?

Direct restorative materials are placed and formed intraorally while indirect restorative materials are used extraorally to produce prostheses. Some examples of direct restorative materials are Composite Resins, Glass Ionomers, Compomers and for indirect restorative materials is Porcelain Materials.

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Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b