Fill in the blank below with the vocabulary word that best completes the sentence.

using a( blank ) clock, scientists are able to estimate the amount of time that two species have been evolving independently.

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