Why are domains needed in classification?

Which is an example of a decomposer? a. bear b.algae c.grass d.bacteria d bacteria

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Development has provided electrically for less money but what may be considered a cause of nuclear power