Which statements about scientific explanations are true? i. scientific explanations must prove that a hypothesis is true. ii. scientific explanations should be based on evidence or data. iii. scientific explanations must have logical and consistent arguments. iv. scientific explanations should use scientific principles, models, and theories.

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 temperature of one mole of helium gas at stp?

Which characteristics can be used to differentiate star systems? check all that apply.