What patterns can be used to identify the ancestry line of an organism

What type of genetic drift would be simulated if all the beans that were not selected died out?

My question says on my assignment. read the following scenarios and decide which of the properties of life are being described. the first one is. katherine stopped on the way to school to grab some donuts. 2. because a dog cannot sweat, it has to pant in order to stay cool. 3. an elephant trun had no bone but 4,000 muscles. i have no idea what i am supposed to anwer. i can't find the answer in my notes or book that i can understand anyway

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