1. what is hypoxia?
a. reduction in water levels
b. depletion of oxygen
c. having excess sediment in the water
d. a form of run off

2. what are the main pollutants that contribute to hypoxia in water?
a. organic chemicals
b. infectious agents
c. plant nutrients
d. metals

3. in the gulf of mexico hypoxia results from agricultural chemicals used in various us states.
true or false?

4. why is a hypoxic zone sometimes called a dead zone?
a. fish and other water organisms cannot live without sufficient oxygen
b. people cannot swim in the water
c. algae will not grow in the water
d. the water contains many bacteria and viruses

5. hypoxia in the gulf of mexico is an example of point source pollution.
true or false?

6. how do wetlands control hypoxia?
a. contribute nutrients to the water
b. contribute sediment to the water
c. speed up the flow of water
d. filter nitrogen and phosphorus from the water

7. controlling sewage water can control hypoxia.
true or false?

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes.which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature.sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent

He table below gives the atomic mass and relative abundance values for the three isotopes of element m. relative abundance (%) atomic mass (amu) 78.99 23.9850 10.00 24.9858 11.01 25.9826 what is the average atomic mass (in amu) of element m? 2.86 5.36 24.30 24.98

Which of the following is true about the speed of light? it depends on the wavelength.