Which of these is a characteristic of a virus? it is generally to other living things. it is visible without a microscope. it reproduces inside living cells. it is able to grow and reproduce on its own.

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 are fossils of organisms that existed over a wide area but only for a limited time period called?

Asample of sea water contains 6.28g of sodium chloride per litre of solution. how many milligrams of sodium chloride would be contained in 15.0ml of this solution?