answer is antibodies.
B cells are a type of lymphocytes and it is responsible for the immune system. B cells help to protect body by producing specific antibodies to fight against each antigen which are strangers to the body specially for viral infections.
Answer:
the troposphere directs the light towards us.
Virus is non living, but once it gets a host (something to live on), it is a living being.
I believe the process by which ions join to reform the solid is called precipitation. It is a process in which ions leave a solution and regenerate an ionic solid. For example; Ag+(aq) + Cl-(aq) = AgCl (s). Dissolution on the other hand is the process in which an ionic solid dissolves in a polar liquid; it is the opposite of precipitation.