A biology professor of mine put it this way: pretend you are reverse engineering alien technology. The stuff you are trying to understand was not designed by human minds. It was designed by evolution over billions of years, literally an alien intelligence that doesn't "think" anything like you do.
A big difference between biology and human engineering is that humans like one-part-one-function and linear chains of cause and effect. Biology isn't like that at all. It's an analog causal matrix where everything affects everything else to varying degrees and most parts have multiple simultaneous functions.