PLEASE HELP ASAP!!

Geography

1 answer:

zaharov [31]3 years ago

5 0

Answer:

Demography: the investigation of the attributes of human populaces. 

Explanation:

Demography: the investigation of the attributes of human populaces. Age, race, sex, different models incorporate where individuals live, where individuals are going, where individuals are conceived, where individuals pass on. 

Check is a flat out number of a populace or statistic occasion happening in a predefined time and spot. - essential enrollment frameworks, authoritative records, a few nations don't have these records, so you should locate an alternate method to get information for example a yearly study.

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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).

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