Kelly is walking on the beach when she finds an interesting rock she picks it up exam is it and wonders what type of rock it is and how the rock was formed what type of rock did kelly find it how can you tell and describe how the rock is formed

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 many moles of gas are present if p=11 atm, v=12l, t=185k?

Chemistry worksheet - i am not sure what they are asking for exactly?