Which "sphere" is not directly studied in one of the main branches of earth/space science (geology, astronomy, meteorology, or oceanography)?
a. biosphere
b. exosphere
c. atmosphere
d. hydrosphere

The correct answer is letter A. Biosphere is not directly studied in one of the main branches of Earth/Space science. This is a branch of science that focuses on living organisms that are living in different populations or communities all over Earth. The other three choices directly study these branches of Sciences.

Unique question.well, using science, you cannot create or destroy even if you do eat yourself so you would not grow twice as big, nor would you disappear. you would stay the same but change states potentially, or at least change your appearance (obviously).hope this . keep up these unique questions.

Largely uneconomic because they provide little profit or food surplusi think so