Which of the following is the best example of natural selection? A population of arctic foxes undergoes a seasonal coat color change from brown to white as soon as snow covers their habitat. Field mice born during a year with excess wheat will gain muscle mass and thus have offspring that have an increased muscle mass. Trout that are born with darker scales are better able to survive in the shadows among the river rocks.

the united states constitution is the supreme law of the united states. the constitution, originally comprising seven articles, delineates the national frame of government. its first three articles embody the doctrine of the separation of powers, whereby the federal government is divided into three branches: the legislative, consisting of the bicameral congress; the executive, consisting of the president; and the judicial, consisting of the supreme court and other federal courts. articles four, five and six embody concepts of federalism, describing the rights and responsibilities of state governments, the states in relationship to the federal government, and the shared process of constitutional amendment. article seven establishes the procedure subsequently used by the thirteen states to ratify it. it is regarded as the oldest written and codified national constitution in force.

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