Foreign invaders have proteins called antigen, which antibodies lock onto to neutralize. The foreign proteins are different from proteins in our own body, so the immune system can recognize them and finally eliminate them.
Answer: True
Cell -> Tissue -> Organ -> Organ System -> Organism.
Jewiwjwiwjjwiwbwjwiwbwhiwhwhwiwiwbwuwijwhe
Answer:
D. El Parque Nacional Yellowstone pronto estará bajo un nuevo liderazgo
