These businesses can stand the test of time in a diversified portfolio.Many investors are worried about a resurgence of turbulence in the markets and what that could mean for stocks in the weeks and months ahead. But great businesses can withstand the test of time and provide meaningful portfolio returns. Concerns about the U.S. economy, its impact on the global economy, and the trickle-down impact of inflation on businesses across industries are legitimate.At the same time, if you're investing your cash in ...