Clarity why a diagram of evolution looks more like a bush than a straight line

The reason why an evolutionary diagram looks more like a bush than a straight line is the development of new species.

To be more clear - initially we can have one species, and that species will over time start to live in multiple different environments. As the species starts to adapt to the new environment, its appearance and genetics are gradually changing in order for it to have more advantageous traits to survive in the environment. As the time passes, the changes that will emerge in some members will create a new species, and that process will constantly go on, until extinction that is. So we have one species that is an ancestor of multiple new species, thus the family tree, or rather evolutionary diagram, starts to branch out, and as the time passes, it will branch out more and more and take a bush-like looks.

rtgh gf tfg sxzt hgstr hsd gh trh fhrd rd

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation: