B - They have repeating steps
The statement that best describes the difference between a gene and an allele is that a section of DNA that usually contains the code for a specific protein that determines a specific trait is a gene, while an allele is a section of a gene. The correct option among all the options that are given in the question is the last option or option "D".
Answer:
Density is an intrinsic physical property of minerals that relates to the composition of the mineral and to the pattern in which the mineral’s atoms are arranged.
cells are not the smallest unit of life because atoms are smaller than cells
