The diaphragm adjusts the on a light microscope.

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.