The answer is A. cleavage, differentiation, fertilization, gastralution
examples of vestigial structure would include the tail bone, wisdom teeth, and the appendix. hope this helps :)
Answer:
In the human adult, the bone marrow produces all of the red blood cells, 60–70 percent of the white cells (i.e., the granulocytes), and all of the platelets. The lymphatic tissues, particularly the thymus, the spleen, and the lymph nodes, produce the lymphocytes (comprising 20–30 percent of the white cells).
