over time things come and go.

over time the design of creatures reflect their usefulness.

We have arms of this length?....why?...well perhaps a lot of reasons, but mostly what we know is true is that the humans before us that had arms of this length had children....

Its like my skin color....why am I this color and not another?..
There might be a lot of reasons, but mostly the answer is that the family tree Im a member of had children.

The design of my body is the result of the designs of billions and billions of members of my family tree all having children and and mixing with others from other family trees.

The results are unpredictable,,,some helpful, some not helpful....
Parenets from two different family trees have children, and each child is different.....


The members of my family tree that had design elements that were not helpful to having children were dropped out of the family tree because they did not have kids...

we have to remember, that evolution is a tool of the Father ...it reflects how he decided to work in His creation.
The tools of the creator might not be the same as the creator, but they can tell us about some of the creators thinking in his work....they reflect the maker's hand...