Which has been observed in the study of embryology? species whose embryos have similar traits rarely have a common ancestor. species whose embryos have similar traits always have similar body forms as adults. all traits present in early embryos remain throughout development. some traits in certain embryos disappear as the embryo develops

Answer;

Some traits in certain embryos disappear as the embryo develops

Explanation;Embryology is the study of embryos. Embryos of different animals such as mammals, birds, fish, reptiles etc. look alike that is they are very similar. Many traits of one type of animal appear in the embryo of another type of animal.Similarity in embryos among animals shows commonality in terms of evolutionary relationship, implying presence of common ancestry.Some traits in certain embryos disappear as the embryo develops, for example the gill slits in human embryos disappear as the embryo develops.

The correct answer is c

Ithink the dna sequences may vary but the amino acid sequences are identical.