Which organ system contains the small intestine?

Depending on the organism the number of in a cell may change

According to the cladogram, which organisms have roundworms as a common ancestor?

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