Which type of powers given to Congress are spelled out in the U.S. Constitution?

For testing a research hypothesis, the burden of proof that a new product is no better than the original is placed on the new product, and the research hypothesis is formulated as the null hypothesis

Indicate whether the statement is true or false

Over time, surface-level diversity becomes less important, and deep-level diversity becomes more important to group cohesiveness

Indicate whether the statement is true or false