Brody 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
Responses

all life lived in the sea
all life lived in the sea

invertebrates developed
invertebrates developed

single-celled life
single-celled life

dinosaurs flourished
dinosaurs flourished

organisms with shells and outer skeletons developed
organisms with shells and outer skeletons developed