If cave salamander didn’t evolve from sighted ancestors, it eyes would be a vestigial structure.
Cave salamanders live in the zone, with complete lack of light (dark zone), so this organisms adapted to that environment with blindness. It is believed that cave salamanders evolved from the ones that could see. The explanation of why they lost their sight is that they conserved energy needed to maintain sight to be more successful in reproduction.
Answer: B Because is that person is sick and sneezes and another does the virus could've made more of its self and wanted another host so the other person with come down with the same sickness.
Explanation:
I would say false
Have a good day!
Crossing over increases genetic variation because due to this, each of the homologous chromosomes get a new combination of traits/ genes and since a each cell has different homologous chromosomes, genetic variotion will occur
