No it doesn't; it forms directed acyclic graphs. (Consider the fact that all humans share a common ancestor). There are probably parts of biology where reproduction does form a tree, but given the existence of horizontal gene transfer, I am not confident in speculating what they are.
No it doesn't; it forms directed acyclic graphs. (Consider the fact that all humans share a common ancestor). There are probably parts of biology where reproduction does form a tree, but given the existence of horizontal gene transfer, I am not confident in speculating what they are.