Why is my financial adviser suggesting I invest in mutual funds?

My financial adviser has been very adamant about my pushing forward an aggressive mutual fund strategy. She has recommended a pretty diverse portfolio of funds, but why would I want to throw so much of my savings (not just a few thousand dollars, rather a very large chunk of money) in to the market given the current economic state? I have a long term investment horizon, and I understand market cycles; though I’m still unsure of her suggestion. Any advice out there?

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