
Topics:
Microbio (Viruses) Specialties: Neurological and Geriatric Skin Appendages Healthcare Careers Food for Thought Nutrient Cycling Glucose in the Body Integumentary and Musculoskeletal Systems Microorganisms, Health and Diseases Food Diseases of The Nervous System Coronary Heart Diseases The Brain Our Control Center Thyroid and Intro to Endocrinology Warm upOther quiz: Systematic Bacteriology
What is the common ancestor of letters A, B, C, D and E?
A. 1
B. 2
C. 3
D. 4