How would you measure the effect of reactant concentration on the reaction rate

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

Which type of bonding involves the complete transfer of a valence electron from a less electrogrative atom to a more electronegative one

Consider the story you just read. all but one of the choices below indicate that something is living.