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
O
D. dinosaurs flourished
E. organisms with shells and outer skeletons developed

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

the answer would be d : p

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves