Which of the following would be the latest in the development of a human fetus?

bone starts to replace cartilage to form the beginnings of a skeleton

the fetus grows to reach approximately eight centimeters in length

cells divide into the endoderm, mesoderm, and ectoderm

the nervous system begins to develop and can control basic body functions

Which of the following initial observations would more directly lead to this research study? a) ginko biloba is cost effective and also possesses heart-protective, antioxidant, anti-inflammatory properties. b) metformin is an effective treatment of patients with t2d, but shows side effects that complicate the disease state. c) over the past several years, the cost of treating t2d within the united states has increased dramatically. d) many plants contain molecules that improve the health and quality of life of patients with a variety of diseases like t2d. e) t2d affects millions of individuals in the usa and worldwide many of who could benefit from improved therapies.