Hair in your nose and mucus help to trap dust, bacteria, and other materials from going into your lungs when you breathe in.
Topics:Respiratory Forensic Pathology Medicine on the Western Front Microbiology Respiratory System Tongue and Skin Parts of the Skin Macromolecules Branches of Medicine Homeostasis - Vision Correction Cell Diversity - Organization, Tissues, Plants and Animals How the Eyes work The Musculoskeletal System Monoclonal Antibodies Histology
Other quiz: Asexual Reproduction
What is a variation?
A. a trait that helps an organism survive in its habitat
B. genetic variety within a species