Why do we not have an eclipse once a month? 

Which statement best describes the age of our solar system and the universe?    

If the sun did not exist we would still see the moon. 

Which planet has the shortest orbital period? Explain WHY? 

A region of turbulent plasma between the Sun’s core and photosphere at the surface, through which energy is transferred.  In this zone hot plasma rises, cools as it nears the surface, and falls to be heated and rise again.

The final stage in the life cycle of the most massive star is a   

Histamine, Prostaglandins, and Leukotrienes are all cytokines that trigger

A patient has just been bitten by a venomous snake.  The treatment for this is to inject them with antivenom antibodies.  This treatment is an example of

True / False B-cells that self-activate can form Memory B-cells.

Which antibody class is able to cross the placenta?