Is Physical signs (properties change) of a chemical reaction indicate that a new substance has been made from old substances through a chemical reaction, true about chemical reaction

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

Explain how the integumentary system plays a crucial role in the ability to maintain homeoestasis

Match the mixture with the substance// i really need on this guys (it’s a pic btw)