¿Cuál de los siguientes compuestos pertenecen a enlaces iónicos? * CaO, NF3, H2O, SeO3, HCl
K2O. MgI2, FeI2, N2H4, SO2
NaCl, KI, Fe3S3, KBr, MnCl2

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

its first and third is your answer i did the qustion the fourth isnt right

the answer is b   just took the test