If you accept microevolution

[jamesmorlock]

Simply because they are identical.

Consider an analogy:

Imagine that you can travel across the universe by walking. You have an infinite amount of time to do this, but you must make your journey by taking small steps. You have no destination, but you can go anywhere and you must never stop walking.

A thousand years pass. Where are you now? Further.
A million years pass. Where are you now? Even Further.
A billion years pass. Where are you now? Far, far away.

For every iteration of time, you will have traveled further and further. It is inevitable, for every small step takes you further. It is not possible to not travel far.

Microevolution is the small step. Macroevolution is the collective of small steps over a large period of time.

When walking for billions of years, how can you not be far away from your starting point?

[Autodidact]

Critical: Are you asserting that science has NOT observed any new species coming into existence?

btw, are you familiar with ring species?

[Critical_Thinker]

[nygreenguy]

[Critical_Thinker]

[Autodidact]

I believe that we both agree that mutations occur infrequently (especially beneficial mutations) and are non-directional, that is, they could either be neutral, beneficial or detrimental (harmful) to an organism.

This is not correct. Mutations are common. Every organism has some mutations, including you.

[Critical_Thinker]

[Goat]

[Critical_Thinker]

[Autodidact]

[Critical_Thinker]