Suppose Q is the midpoint of PR. Use the information to find the missing value. PQ= 6x + 25 and QR = 16-3x find pr

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

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?