What are the sources and sinks(store) of carbon dioxide in the atmosphere?

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.

Which number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?