occupational structure is the distribution of profession or jobs to the people in a society according to their social status, education etc.
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Within the biosphere, all of the Earth's other spheres work together.
The root word "bio" means life, and in biology, that is what we are studying! The biosphere encompasses the life in all parts of the Earth. The water (hydrosphere), the air (atmosphere and troposphere), and the ground (lithosphere). These are all driven by life, which is what they all have in common.
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The Glossopteridales is the correct answer
