100 POINTS PLEASE HELP Balance the equation then choose the coefficient for blank 2 (in front of O2)

___ Na + ___ O2 --> ___ Na2O

State the formula for density in words and mathematical symbols

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

Agas can holds 2.0 gal of gasoline. what is this quantity in cubic centimeters?