The electrons of an atom

What is the name of the compound that has four phosphorus atoms and five oxygen atoms?

Which of the following provides a first line of defense against pathogens?

The “respiratory membrane”in the lungs through which oxygen in the air travels to enter the blood stream is a combination of…

Which of the following might your body perceive as an antigen, as opposed to your MHC’s. 

Which of the following is not a role of the lymph nodes?

Respiratory control centers are located in the

How would you classify sucrose (table sugar)?

Which of the following is/are true regarding purkinje cells?

A fantasy element, Fluon (Fl), has two isotopes with the following masses and abundances.  Isotope Mass (amu) Abundance Fl-70 70 50% Fl-72 72 50% Choose the closest estimate to the average atomic mass of this element.