Counter the same person occur in nature

Solution-Select an article about medicine invasive species
April 25, 2020
Solution-Determining the brown coat color
April 25, 2020

Counter the same person occur in nature

Question: If I become a Devil’s advocate and quote an example of a water animal becoming a land animal that gets back to water to become a whale, and that DNA or RNA could have been that water animal that was switching to each other. Can you still justify what came first – DNA or RNA?

Question: Discuss how do you counter the same person who says that if the process does occur in nature, there is no such thing as natural selection, but it needs a designer (GOD) to carry out those specific steps?