When you go down the food chain by keep asking the question what does it eat at what catogory of living things do you always end up

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? the wings are analogous structures that evolved differently and do not have a similar internal structure. the wings are homologous structures that evolved differently and do not have a similar internal structure. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. wings of bats are vestigial structures, but the wing structures of birds are not vestigial.

What substance acts to prevent sudden ph changes in bodily fluids?

Which label correctly identifies what x represents in the concept map?