Answer:
A) homologous structures
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)
Sunlight is the major source of energy for life on earth and it is also unlimited. :)
