Where should the biosphere label appear in the systems model? Use reasoning to explain your answer.

Explanation:

Biosphere is the portions/regions of the earth (including land, sea and atmosphere) where living organisms exist. From the picture attached, it can be seen that there are living organisms in the hydrosphere (fishes), geosphere (plants) and anthrosphere (human).  The entire system should have been labelled biosphere and not atmosphere.

NOTE: Atmosphere is an empty air space surrounding/around the earth (or other celestial body).

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.