Mineral

if i said that mineral had “glassy” luster, but you looked at another sample of the same mineral and thought it had a “dull or earthy shine”, then how could that be? why isn’t luster a good property to identify minerals on its own?

2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.