Not being exposed to the wrong antigens at the wrong time and being exposed to the right antigens at the right time You need both of these to happen. For most people the timing of these things isn't quite right...
2 Answers · Science & Mathematics · 02/04/2013
q.2- puberty q.3- they r found only on pollen q.8-infectious q.9- amniotic sac q.10- cerebellum q.12- fertilized egg splits into two zygotes q.14- cervix q.18- placenta q.20- lungs q.28- oxygen-rich blood. q.30-c. passive immunity
3 Answers · Science & Mathematics · 01/04/2013
This is your professor. All of these questions should be easily found in your text. If you really want to learn, look up the answers yourself! We are always watching :-).
3 Answers · Science & Mathematics · 11/04/2010