Answer:
A) homologous structures
Step-by-step explanation:
A) homologous structures: parts that have similar position, structure, and evolutionary origin, but not function (seal's flipper vs human's arm)
B) analogous structures: parts that have similar function, but differ in structure (wings of an airplane vs wings of a bird)
C) vestigial structures: anatomical features that no longer have a function in the current form of the organism (wisdom teeth)
D) embryology: the study of the formation, growth, and development of the embryo (from gamete to fertilization to zygote to embryo)