Judge the following sentence according to the criteria given below: Carbon does not limit primary productivity BECAUSE various forms of carbon are quite abundant in the ocean
A) The assertion and the reason are both correct, and the reason is valid.
B) The assertion and the reason are both correct, but the reason is invalid.
C) The assertion is correct, but the reason is incorrect.
D) The assertion is incorrect, but the reason is correct.
E) Both the assertion and the reason are incorrect.
A
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Indicate whether this statement is true or false.
Aquaculture has been beneficial in enhancing productivity, but may have negative effects by ____
A) ?increasing damage to structures from wind and wave energy in submerged pens B) ?concentrating farmed fish waste through open-ocean systems C) ?reducing the genetic diversity of wild fish from escapes D) ?increases the amount of wasted feed by moderating the number of farmed fish in each pen
When an acid is added to a solution no gas is formed. Which of the following ions cannot be in the solution?
A) CO32- B) PO43- C) SO42- D) none of these
Travertine and ________ differ in form but are made of the same material
Fill in the blank(s) with the appropriate word(s).