D. the removal or chemical alteration of the majority of a contaminant
Answer: Political scientist
Explanation:
Political scientist is the person who studies beginning, development, trend and function of any political system as a finding or research.This study is based on studying political regulation, operations, government policies,political history etc.
According to the question, David should contact political scientist for gaining information about highest expected age-group to vote in election as per their analyzation and study of political system or field and trend.
Answer:
Two
Explanation:
Federalism is a system of government that creates two relatively autonomous levels of government, each possessing authority granted to them by the national constitution.
Stereotypes can be based on all of the above.
Tortoise differ from turtles in four aspects, but the most important is that tortoises are terrestrial and turtles are from the sea: First, turtles live only 15 to 20 years, the longest 30 years, while tortoises live 100 years on average, reaching one up to 180 years. Second, the turtle has the soft shell to swim, while the tortoise has hard shell to defend itself on land. Third, tortoises are animals with long paws and nails, while turtles have fins and can not walk ashore; finally the turtles are peaceful and calm, while tortoises are adapted to a hostile environment and are brave and ferocious animals.
