What hard, tough, and shiny substance covers the teeth?
Topics:Composition of Blood and Blood Cells Living Organisms & Animal Behaviors Source of Food Benefits of Physical Activity Parts of Human Body Ecology Viruses Biomolecules Musculoskeletal System Disease Nutrition and Calorific Value Diet Chemistry Human Organs Prokaryotic Cells and Viruses ology & phobia
Other quiz: Nutrition
In a healthy well fed individual ______________ is act as an barrier and prevent the entry of pathogens.
B. mucosal membrane
D. all the above