White blood cells protect against
antibodies
⇒ pathogen, pathogens, virus, viruses, bacteria, chemical, chemicals, harmful, substance, substances and aid in blood clotting when injuries are sustained.

For each description below, select the correct white blood cell from the drop-down menu.

include T and B cells that are used to produce antibodies against antigens and destroy pathogens that enter the body.

engulf, destroy, and digest pathogens such as bacteria in the body.

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you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.