what are the flaws in the methods section of this article

/in /by

I posted an article about microplastic plastic pollution. I need help figuring out the flaws in this study such as what they should have done or what assumptions they overlooked or how could this study be improved.

"Our Prices Start at $11.99. As Our First Client, Use Coupon Code GET15 to claim 15% Discount This Month!!":

Get started