The genotype of persons with the sickle-cell trait, but often not exhibiting sickle-cell, is -HbA HbA
-HbA HbS
-HbS HbS

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone

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.

Can nonrenewable resources be used sustainably?