So, let me test my understanding, and please correct me where you can as needed.
There are similarities in all life since we share common ancestry.
You suggest that one area of this similarity is immigration being analogous to weeds or foreign plants entering a garden.
That to better understand the cultural exchange and resistance issues involved with immigration, we could study what happens when plants are introduced to a new bed/garden/etc.
Cultures will merge together, and this could be analogous to the cross-breeding of seeds (apricot + plum = pluot...).
Some cultures are more invasive/imperialistic than others.
Often, those native plants will fight the newcomers for resources.
That this similarity stems from the original source of life to which every current life form is connected?
It's a fruit if it has seeds.
