C. 6.81x10^-4
It is negative 4 because the 6 is 4 digits away from the first 0.
Scientific notation has one number and then the decimal place so it can not be A or E.
Prevent tyranny by acting as a check on power.
Our environment can change our behavior in many aspects. Suppose you want to play golf with your friends, as you predicted it is going to be a sunny day but suddenly the environment changes and it converts into a rainy day then you have to change your plan.
Humans and Environment are interconnected as they both constitute the whole Biodiversity (biggest ecosystem), and Geography explains their relationship
Hope this helps!
B. Napoleon invaded Spain and Portugal - situation in Europe particularly in Spain provided an opportunity for Spain's overseas territories to fight for their independence. Napoleon's army occupied Spain and Portugal where he wanted to change a king which resulted into civil war.
