11. The temperature at which the solid and liquid phases of matter exist in
equilibrium is called its
(1) melting point
(2) boiling point
(3) heat of fusion
(4) heat of vaporization

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

In 2002, the rare earth elements mine in mountain pass, california was closed because

Adepositional also feature that forms where a stream enters a lake or an ocean is a