Which has a lower density - dark coloured scoria or light coloured pumice?

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

Asap many people try to eliminate fat from their diets which is one reason it is necessary for humans to eat fat a) fat is the only way to get energy b) every cell in the body must contain fat c)fat stores less energy than polysaccharides d) saturated fats make blood vessels healthier

What are the three different shapes or structures shapes or structure of carbon-based molecules?