Anyone alive in this world? :')​

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

Which chemical equation is unbalanced? which chemical equation is unbalanced

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.