No fossil records have evidenced transference between basic animal groups. Relevant evidence is essential to prove an argument. It’s not a matter of “making a decision for someone else” it’s a matter of knowing your “decision” is based on good reason and not an illusion.
All conclusions are based on assumptions.
Even if we all follow the exact same process to reach our conclusions, if our starting points are not the same, those conclusions will be different.
Fossil records show a increasing complexity of life forms, starting with simple single celled organisms and progressing to more complex and diverse types and species of animals. It doesn't support simultaneous appearance of all species at once.