What does characteristics mean in science?

What is the difference between petrifaction and permineralization? What is another name for the dependent variable in an experiment? How can you compare and contrast an experiment? Does a variable change in an experiment? When light is reflected from a rough surface the reflective light does what producing no image? Why is it important to record all observations and data during a science experiment? Can you give necessary sentence examples? 22 kg equals how many pounds? Which microscope creates an image of the surface of a sample? What are the results for a capsule stain for alcaligenes faecalis? Why were the ideas of Darwin and Freud hard for so many people to accept? How do you use data in an sentence? Why were tires invented? What type of listening would be most appropriate for a campaign speech? What makes the current flow in a circuit? What expansion does a hardwood floor need? What are the uses of cryonics? What is the basis for making conclusion? What are the most common high school science project themes? Air is cooled and pressurised to liquefy it As it cools a solid separates What is the identity of this solid?