The ancient egyptians were the first known people to develop
a. wooden boats
b. military armor
c. a 365-day calendar
d. a system of writing

On this graph, the top horizontal line represents a price floor set above equilibrium. a price floor set below equilibrium. a price ceiling set above equilibrium. a price ceiling set below equilibrium.

Select the correct answer from each drop down menu. among these figures figure and blank have the same volume. 1 a c e 2 b d

What major factors play a role in global warming? 1. human activity and normal climate conditions 2. natural factors and human activity 3. normal climate conditions and abnormal human activities 4. abnormal human activities and natural factors