Which scenario best describes an object with a displacement of zero? a train moves uphill as it travels in a straight path. a person walks 2 miles north and 2 miles west. a ball rolls from the top to the bottom of a hill. a race car starts and ends at the same point on a track.

In order to study genetic mutations, scientists must study genetic material. which statement describes the genetic material scientists are most likely studying? a) they study alleles that contain chromosomes, which are rna.b) they study alleles that contain genes, which are chromosomes.c) they study chromosomes that contain genes, which are dna segments.