Sylvanite is a telluride mineral found in the Transylvania region of Romania. Sylvanite is 6.3% silver and 34.4% gold by mass. How many atoms of gold are present in a 250-kg sample of sylvanite?

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

Ted and emily played a mixed doubles tennis match against jack and brenda. in the second match. ted and brenda played against jack and emily. which type of chemical reaction does the situation demonstrate?