If we leave aside the inanimate things (rivers, sun, etc.), the rest is based on selfishness: trees produce fruits to reproduce; plants have fragrant flowers to attract insects (to also reproduce) and so on....
If you look closely and zoom in on nature, you will find selfish genes.
Yes and I often make sense of human nonsense based on the instinctual aspects. I think men and women are still ruled by their basic survival and reproductive roles/demands but women hate being told that. It doesn't seem to bother men but we tend to laugh about bodily functions. It might be a psychological aspect of believing humans are a higher species, so above mere instinctual concerns, but I think our gender similarities indicate something more basic at work.