Simple.....whatever science can actually "prove" rather than what they "assume" is true from the way they interpret evidence. If you read what evolutionary scientists write about their conclusions, if they use the the words, "might have"...."could have"..."leads us to conclude that"....."must have"....etc, you know that this is 'assumption', not provable fact. Their articles are riddled with such terms, which means that they really have no proof for what they are asserting (as all the scientists here keep telling me, there is no proof in science) so their conclusions are based on educated guesswork. IOW what science teaches as fact is not really fact, but only what they "believe" happened all those millions of years ago. There is not a single shred of solid, substantiated evidence that single celled organisms transformed themselves into creatures as big as a multi-story building with nothing directing the process except blind chance.
I look at the incredibly complex processes that are programmed into biological creatures and I see design, some of it brilliant! I see purpose and interdependence in an ecology that was designed to support all this "life".....blind chance is so out of the question when you really look at what scientists are assuming.
Use your eyes as well as your heart......we are not just 'biological' and neither are they.
(Google Images)
I could fill pages with images of these creatures and never get to the end.....the very sight of them stirs something in the human heart that moves it to praise the Designer of all these beautiful and unique living things who share this planet with us. Such diversity could never be the product of blind forces because blindness cannot create or appreciate beauty....or give us a sense of majesty.
Tell me if you think any of these creatures would exist if it were not for the senses that they were given? We often take them for granted....sight, hearing, taste, smell, touch....you really believe that such functions are merely biological accidents?....that nothing intelligent designed them? Now tell me what use those senses would be without a brain to process them all and to direct the body to act? Tell me who programmed these creatures to sustain themselves so that they can replicate their 'kind' perpetually?
If we can't 'see' design...then IMO, we have been 'blinded' in ways we cannot discern. One can never say "I see" and really mean it.