How do B cells know when to make antibodies? A.) They are alerted by Helper T cells.

B.) They are always making antibodies just in case that pathogen is present.

C.) They are alerted by Macrophages.

D.) B cells will simply find the pathogen in the body and immediately begin making
antibodies to fight the pathogen.

What is the 77 element on the periodtic table

Which blood cell spend most of their time in the lymphatic system?

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen