The atomic number of fluorine is 9. How many electrons does an ion of fluorine have if it is represented by the symbol shown below? 19F1-

A. 8 electrons
B. 9 electrons
C. 10 electrons
D. 20 electrons

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 do you lengthen a pattern piece? (family and consumer science, sewing)

Earth's axis of rotation is tilted at an angle of 23.5 degrees. what is one change you would see on earth if its axis was not tilted?