In the 1900s, were based in north america, while were based in europe.

   The correct answer is :  Comparative biologists were based in North America, while ethologists were based in Europe.

Explanation:  Comparative biologists formulate hypotheses and in some cases predictions from an existing body and then test them by means of experiments.

Ethologists study the behavior of animals in their natural environment. The etiology is a branch of zoology.

separation of powers, therefore, refers to the division of government responsibilities into distinct branches to limit any one branch from exercising the core functions of another.   the intent is to prevent the concentration of power and provide for checks and balances.  

the traditional characterizations of the powers of the branches of american government are:

* the legislative branch is responsible for enacting the laws of the state and appropriating the money necessary to operate the government.

* the executive branch is responsible for implementing and administering the public policy enacted and funded by the legislative branch.

* the judicial branch is responsible for interpreting the constitution and laws and applying their interpretations to controversies brought before it.

forty state constitutions specify that government be divided into three branches:   legislative, executive and judicial.   california illustrates this approach; "the powers of state government are legislative, executive, and judicial.   persons charged with the exercise of one power may not exercise either of the others except as permitted by this constitution."

while separation of powers is key to the workings of american government, no democratic system exists with an absolute separation of powers or an absolute lack of separation of powers. governmental powers and responsibilities intentionally overlap; they are too complex and interrelated to be neatly compartmentalized. as a result, there is an inherent measure of competition and conflict

minnesota:   minnesota house research,   separation of powers: when statutes and court rules conflict, 2005

nationalization is the set of dispositions and operations by means of which the state assumes, in varied form, the administration of private companies, of groups of companies or of the totality of certain economic sectors previously managed by individuals, such as the land portions. nationalization is the opposite of privatization. it is also called nationalization of the means of production, although a nationalized company can be previously both national and foreign ownership. nationalization or nationalization is a very characteristic action of ideologies such as socialism and nationalism.