In which part of the river would you expect to find high oxygen levels, low nutrient levels and low diversity levels?

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

What field of science did harry hess study?