Alternative 1: 60 credits in biology, chemistry and/or earth sciences, including The Evolution and Diversity of Organisms (15 credits), Molecular Biology and Genetics (10 credits), Life and Interactions of Microorganisms (5 credits) and participation in Cell Biology (15 credits). Alternative 2: 60 credits in biology, chemistry and/or earth sciences, including Biology A: Patterns and Processes (22.5 credits), or Biology A: Patterns, Processes and Science Education (22.5 credits), and participation in Cell Biology (15 credits). Alternative 3: 60 credits in chemistry, including 10 credits in biochemistry and participation in Cell Biology (15 credits).