evidence
what is observation
Empirical evidence is information acquired by observation or experimentation. Scientists record and analyze this data. The process is a central part of the scientific method.
what is chromatography
Chromatography is a laboratory technique for the separation of a mixture. The mixture is dissolved in a fluid called the mobile phase, which carries it through a structure holding another material called the stationary phase. The various constituents of the mixture travel at different speeds, causing them to separate
what is inference
We learn about some things by experiencing them first-hand, but we gain other knowledge by inference — the process of inferring things based on what is already known. When you make an inference, you're reading between the lines or just looking carefully at the facts and coming to conclusions. You can also make faulty inferences.
what are the different sizes of footprints
small,big,medium,
fingerprints
loop, whorl, arch, composite
what are the different types of fabric that can be found at a crime scene
wool,silk,cotton,etc