If organisms have similar dna structure what does this suggest about their ancestors?

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming

If your blood becomes too concentrated with iona, what will happen to the red blood cells

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?