When the body senses foreign substances (called antigens), the immune system works to recognize the antigens and get rid of them. B lymphocytes are triggered to make antibodies (also called immunoglobulins). These proteins lock onto specific antigens.
<span>Chemical and physical actions of groundwater form </span>Karst topography.
Answer:
I think it's alkali metals
Answer:
C. Ball A is the densest because it sank to the bottom of the liquid.
