Part a: design a food chain with four trophic levels, and identify the organism in each level. what happens to energy as it travels from the bottom up?

part b: can humans ever occupy the lowest, or first, trophic level? why or why not?

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.