Which of he following compounds is always part of an aqueous solution

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

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?

What is a property of a double replacement reaction