To predict whether an object will float two things do you need to know

Which political reform gave people the power to put a proposed law on the ballot? referendum initiative direct primary recall

The two-factor theory of emotion was proposed by

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.