Alaskan fish are some of the least contaminated in the world, and the salmon population continues to thrive despite the yearly fishing. How do they do it? Please give some sites! Need help urgently!

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c. ozone layer hole d. increase in sea levels

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

Explain the significance of the increased cell specialization of the volvocine line