In the following diagram, four different index fossils are labeled: In this diagram, from top to bottom, an index fossil from the Jurassic period is labeled A, an index fossil from the Permian period is labeled B, an index fossil from the Devonian period is labeled C, and an index fossil from the Cambrian period is labeled D.

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Which of the labeled fossils comes from the oldest organism?

A
B
C
D

Which set of terms best describes a community of miners who live out in the countryside of west virginia and use specialized geographical equipment to analyze the composition of rocks

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.

Sarah and john are having a discussion on genetic diversity sarah believes it happens over a long period of time john believes it happens immediately who is correct