Project report on 3 states of matter

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

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

What is the correct term for living the most sustainable life you can within your current circumstances?