Help me I don't really understand what they want I got to do and please provide me an answer

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

Why is a mushroom considered a heterotroph

Why do mountaineers become breathless as they reach high altitudes