How does the current, or sixth, mass extinction differ from the past five mass extinction events? the sixth mass extinction is believed to be caused by human-related factors. the sixth mass extinction is believed to be caused by natural forces. the sixth mass extinction is believed to affect relatively fewer species. the sixth mass extinction is believed to affect relatively fewer areas.

Acid rain is the direct result of acid released by burning fossil fuels. select the best answer from the choices provided ot o f true or false

4.06 hc)a five-year review of threats to the southern resident orca population of the united states concluded that the top threats were prey availability, contaminants, and effects from recreational and whale watching vessels. further down the list are oil spills, disease, and effects from commercial vessels not targeting whales. how might this list be different if it were for transient whale populations, which have a larger average population size and live farther offshore in open waters? a)the transient population is more likely to be affected by contaminants. b)the transient population is less likely to be affected by whale watching vessels. c)the transient population is more likely to be affected by disease. d)the transient population is less likely to be affected by prey availability.

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.