Ascientist studies the dna of three different species. the dna from species a is more similar to dna from species b than dna from species c. which species are probably the most closely related? explain your answer.

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

What is the molar mass of a gas that has density of 2.054 g/l