What are the building blocks of proteins

Researchers want to use edna to look for an invasive species in the water which of the steps would be likely do last

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

Regarding most of the narrator’s story, which word best describes the tone?