What is the independent variable in this experiment, explain your reason.

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

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

Which event would lead to primary succession of a forest?