Anitrogen-containing compound shows no absorption band at ∼3400cm−1 and no absorption bands between ∼1700cm−1 and ∼1600cm−1. what class of compound is it

Si una estrella no tiene paralaje medible, ¿qué puedes inferir?

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 happens when an acid dissolves?