Which is an example of plasmas in nature? solar cells plasma balls auroras clouds

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

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Light waves travel than sound waves.