Which of the following statements explains genetic variation? Genetic variation arises . A. When organisms need to change to survive in a new environment
B. Through mutation and sexual reproduction
C. From environmental changes that affect organisms
D. From traits acquired during the lifetime of an organism

Mars and earth have quite a few things in common. both are  terrestrial planets, both are located within the sun’s  habitable zone, both have  polar ice caps, similarly  tilted axes, and similar  variations in temperature. and according to some of the latest scientific data obtained by rovers and atmospheric probes, it is now known that mars once had a  dense atmosphere  and was covered with  warm, flowing water.