5. Which atomic theory describes atoms with negatively charged electrons orbiting a small, positively charged nucleus similar to the planets orbiting the
sun in fixed orbits?
a. Spherical model of the atom
b. Quantum mechanical model
C. Planetary model
d. Nuclear Model

How important is it to have a powerful army and navy? give two reasons for your answer

The controlled use of fire by hominids: (a) limited the expansion of hominids into certain environments, such as dry grasslands. (b) decreased the amount of food energy available in the hominid diet. (c) contributed to geographical expansion and food production techniques in positive ways. (d) has been shown to contribute little to the digestive process of hominids.

How did the mountains on the oregon trail influence the timing of pioneers’ travels? a.) the pioneers wanted to avoid times when there was snow in the mountains. the pioneers wanted to spend as much time as possible enjoying the mountain scenery. b.) the pioneers crossed the mountains in late fall when the trees were bare and the views were good. c.) the pioneers were rugged people who were not impacted by the terrain they crossed at any time.