In which situation is the principle of cross-cutting relationships useful in determining relative age? A fault breaks through sedimentary layers. Fossils of two different species are found in different rock layers. Sedimentary layers form over millions of years in a lake bottom. Lava flows form on top of one another from several eruptions over time.

Why are adults bigger than they were as children biology

What happens when a magniseum ion ia atracked to a chlrene ion

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.