Design an investigation that uses freezing, melting, boiling or condensation point to identify an unknown substance.

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

How many electrons does silver have to give up in order to achieve a sido noble gas electron configuration

What is the maximum number of electrons that an atomic orbital can contain?