The answer is B.......B.....
Answer:
Primary productivity = 1000 gm/year/sq. meter
Explanation:
Primary productivity is defined as the difference betweeen main gross manufacturing and breathing energy. For the herbivorous, this is the energy available.
It is expressed as "gm/year/sq. meter" = gm/yr/m^2
or "kcal/year/sq. meter" = k cal/year/m^2
In the present case,
Gross primary production = 2000 gm/yr/m^2
Used for respiration purpose = 1000 gm/yr/m^2
So, Primary productivity = (2000 - 1000) gm/year/sq. meter
Primary productivity = 1000 gm/year/sq. meter
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When studying the Calumet region of Illinois and Indiana, Alfred Meyer noted four stages of development as new groups occupied this land. In Stage 4, CONURBANIZATION, new cities spread across new territory and grew toward one another.
Alfred Meyer's sequence of population events:
1) Fur Trading Stage (up to 1830)
2) Subsistence Agriculture Stage (1830 - 1850)
3) Commercial Agriculture Stage (1850 -1900)
4) Conurbanization Stage (1900 - 1953)
Psychrometer is used to measure the humidity of an atmosphere. <span />
