Select the countries are located in North America

Geography

1 answer:

Stella [2.4K]3 years ago

3 0

The countries that are located in North America are Canada, America (United States), Panama and Mexico.

Canada, the United States and Mexico are all in North America. Panama is located in Central America, which is still considered the continent of North America.

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Consider a sample of water from a stream found to have an initial DO of 10.0 mg/L. It is placed directly into a BOD bottle and i

Leokris [45]

Answer:

The BOD5 for this sample is 5 mg/L

Explanation:

The BOD5 takes into consideration the difference between the initial DO and the final DO divided by the fraction of the sample tested in a 300 mL BOD flask. The problem states that the sample was directly placed in a BOD bottle so we assume that the volume used was 300 mL of the water sample. The fraction of water is 1 (300/300).

$BOD5=\frac{DOi-DOf}{fraction}$