If the poles of magnets were not identified, how could you identify them without a compass?

How many moles are equivalent to 55.5g of nano3

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

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.