Select your answer:
Topics:
Skeleton and Muscles Health Issues and Concerns The Blood Muscles Injuries in Archery Respiratory System Oncology Leaves Cell Cycle Problems Respiration in Organisms Vision Med Term Musculoskeletal Effect of Exercise on Cardio Respiratory System & Muscular Mechanical Digestion Anatomy - Cellular RespirationOther quiz:
Movement › ViewWhat is the purpose of white blood cells?
A. To carry oxygen
B. To protect against infection
C. To speed up digestion
D. To trap dirt and dust
Infectious Disease and Pathogens › View
Bacteria are
A. unicellular
B. multicellular