In considering the water quality in and around the US, the EPA analyzes these critical physical states: temperature, light, and
hydrology including rainfall, flow rates, and sea level. What key human activity could result in changes in all of the physical states
listed here?
global warming
release of carbon dioxide into the atmosphere
an ever-increasing hole in the ozone layer in Earth's stratosphere
changes in the hydrologic cycle and rates of evaporation/precipitation
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Can you identify which of the following groups of organisms are, or are not, populations? a. the american bison (bison bison) and grey wolves (canis lupus) currently living in yellowstone national parkb. all of the rainbow trout (oncorhynchus mykiss that) that have ever lived in lake eriec. the group of american bison (bison bison) currently living in yellowstone national parkd. a group of calliope hummingbirds (selasphorus calliope) and a group of rufous hummingbirds (selasphorus rufus) living in the same new hampshire woodse. the northern cardinals (cardinalis cardinalis) living on opposite shores of lake champlain f. all of the whales currently living in the atlantic ocean off cape cod, massachusetts

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time