The Bering Land Bridge was actually composed of frozen ice. They were able to cross because the water was frozen over, and didn't require sailing over open water.
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Explanation:
The legislative branch or legislature is a deliberative assembly that has the exclusive authority to create laws for a political entity such as a country or city, in addition to administering the state budget
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Opportunity cost is the cost of a foregone alternative. If you chose one alternative over another, then the cost of choosing that alternative is an opportunity cost. Opportunity cost is the benefits you lose by choosing one alternative over another one.
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One situation that would definitely NOT lead to an increase in productivity is
D. an increase in the cost of factors of production .
An increase in the cost of production would rather lead to a decrease in productivity - it would make the production more difficult.