(PLEASE ANSWER I NEED TO FINISH THIS!)
Brody studied the geologic time scale and became interested in the sorts of life that existed in each era.

He learned that scientists dated life in this era using the law of superposition and radioactive dating. Which of the following characterizes the Cambrian period? Choose the three that apply.

A.

all life lived in the sea

B.

invertebrates developed

C.

single-celled life

D.

dinosaurs flourished

E.

organisms with shells and outer skeletons developed

Why might a single rock layer exhibit different types of sedimentary rocks within it? view available hint(s) why might a single rock layer exhibit different types of sedimentary rocks within it? such a rock layer, termed a facies, when traced laterally represents a variety of depositional environments that formed in a sequence over time. such a rock layer, termed a facies, when traced laterally represents a single depositional environment that formed over time. such a rock layer, termed a facies, when traced vertically represents a variety of depositional environments that formed at the same time across a broad area. such a rock layer, termed a facies, when traced laterally represents a variety of depositional environments that formed at the same time across a broad area. such a rock layer, termed a facies, when traced vertically represents a variety of depositional environments that formed in a sequence over time.