If the level of 67Ha in recent sediment is 0.80 Bq per gram, and a sample of older sedimentary rock shows a Bq level of 0.20 Bq per gram. How old is the sedimentary rock?

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

What noticeable trend from this graph might be used to make a conclusion?

Why is a mushroom considered a heterotroph