What kind of mixture is sometimes difficult to distinguish form a compound? Why?

Which statement is true about the part of the electromagnetic spectrum that human eyes can detect? it contains only the colors of the rainbow and television waves. o it is divided into seven ranges of wavelengths. it contains ultraviolet, visible, and infrared light. it is divided into nine ranges of wavelengths.

How are elements arranged in a periodic table

Embryos of different species look very similar, which shows that the organisms share a ancestor.