I agree. The definition of evolution can include how life began, but how different disciplines of science agree to divide up the workload adds up to nothing more than a semantic debate.
Every species - including the 99.9% of species that have gone extinct - descended over millions of years by unguided evolution using processes including but not limited to natural selection.
That process got started after geochemistry gave rise to biochemistry - a process known as abiogenesis. This happened amazingly quickly after the earth formed but it was not until the arise of eukaryotic cells that complex life got going. It is possible that bacterial life will turn out to be very common in our galaxy but life of the sort we are familiar with might be unique to earth.
You can read about this amazing event known as endosymbiosis here...
The relationship between species is investigated by biologists, geneticists and paleontologists among others. Abiogenesis is mostly the domain of chemistry and bioenergetics.
Creationists always want to deflect from the overwhelming evidence for evolution - post Cambrian explosion in particular - by demanding a detailed explanation of abiogenesis. The Watchtower does this every time it addresses the subject.