You are working to build muscle to run a marathon and are limiting your diet to only complex carbohydrates and a protein supplement. What is lacking in this diet? Explain why this limited diet will not help you build muscle and give you lasting energy.

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.