In the biogeochemical cycle for carbon, the same atoms of this element are moved and recycled around the planet through which spheres of earth? A. Biosphere and geosphere

B. Biosphere, hydrosphere, and geosphere

C. Atmosphere and cryosphere

D. Atmosphere, biosphere, geosphere, and hydrosphere

The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a.an ionic bond is formed between the oxygen and carbon atoms. b.four valence electrons are shared. c.two valence electrons are shared. d.valence electrons are shared between oxygen atoms.