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Organisms in streams need oxygen to live when lacking dissolved oxygen it will kill these organisms. edit: unless the organisms in the stream are photosynthetic, in which case they will increase the oxygen levels. however, by far, most organisms in a stream are not photosynthetic and oxygenation occurs solely through aeration and surface area dissolving from the air. so, to answer the question, organisms (most organisms which aren't plant-based photosynthetic organisms) decrease the amount of oxygen in a stream. edit: a flowing stream has turbulence which helps aerate the water, increasing dissolved oxygen. In contrast, stagnant water tends to be low in dissolved oxygen, except near the surface. Multicellular animals (like fish) need a good supply of dissolved oxygen to thrive.
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Low dissolved oxygen has many causes....from prolonged hot temperatures, sewage waste, and chemicals.
"http://wiki.answers.com/Q/What_is_the_average_level_of_dissolved_oxygen" in a salt water aquarium
I think you mean picked up. It is the lungs.
It should be zero. We can use as DO standard solution instead of 2.0 M sodium sulphite (because 2.0 M Na2SO3 DO is zero). Refer to the following link below.
there is more dissolved oxygen present in a stream because the movement and the bubbling of the air allows more oxygen to be ingested
i dont know i need help with this question as well
Sometimes, water can become overheated, like if it is near a factory or power plant. If the water's temperature increases, then the Dissolved Oxygen (DO) level will decrease, …which can cause strain or even death for many fish and marine wildlife.
The higher the salinity, the lower the dissolved oxygen concentrations.
The connection between plants and oxygen is that after the plant is done making photosynthesis it releases oxygen into the air and takes in carbon dioxide that we release into… the air. So we are the ones who take in oxygen from the plant. This is a reason why we should not cut down a handful of trees otherwise there will be less oxygen in the air.
As the depth increases, DO decreases up to 2000 to 3000m. But then it increases again as the depth increases. See the link below..
Dissolve oxygen is when oxygen is dissolved and oxygen is just normal oxygen!
A good way to measure dissolved oxygen levels in the human body would be to use a pulse oximeter. It is a little device that you can put on a finger or toe to get the measure…ment.
Decomposers react on organic matter.They utilize Oxygen to breakdown organic materials.So Oxygen level drops.