The lead in lead pencils is pure carbon, c. the mass of a period mark is 0.00010 g. how many c atoms (c’s) make the period mark?

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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

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?