NEED HELP DNA Genes Order the events that occur during DNA replication

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Researchers want to use edna to look for an invasive species in the water which of the steps would be likely do last

In 1992, hurricane andrew left a wake of destruction through florida. one victim of the storm was a reptile-breeding facility. over 900 burmese pythons were set free, and today thousands of pythons live in florida. these pythons are an invasive species, or a harmful species not native to the region. 1. what impacts do you think the burmese pythons might have on local ecosystems