Which example best illustrates the concept of dual federalism?

Which two clauses in the U.S. Constitution have allowed the federal government to expandits authority?  

The framers of the constitution ensured that the federal government would not become toopowerful by installing (circle all that apply):

An election is being held to vote for the President, Vice President, and Secretary of a student club. 8 members in the club are eligible to be selected for one of the three positions, and no two positions can be filled by the same person. How many different ways are there to fill the three positions?

A committee is formed of people. different people can be considered for the committee. How many different groups of people are there?

What is a work breakdown structure (WBS)?

The theoretical net ATP yield from a molecule of glucose is ________ ATP molecules.

Of the following organisms, which one does not use photosynthesis to convert CO2 and water into glucose?

The main product of photosynthesis used by plants for food is/are ___.

Muscle cells use lactic acid fermentation to ___.