Complete the given stems with the prefix which means the same as the word in brackets. There is an explanation to guide you.

Your exercise is sponsored by Babylon Dictionary.

1.	atologist (skin) = a doctor who studies and treats skin diseases
2.	-god (half) = a person who is partially mortal and partially god
3.	atology (blood) = the scientific study of blood and the body tissues
4.	bar (equal, identical) = a line drawn on a weather map joining all the places which have the same air pressure
5.	military (similar) = describes a group which is organised like an army but is not official and often not legal
6.	spect (backwards) = thinking now about something in the past
7.	charge (over, above) = a charge in addition to the usual amount paid for something
8.	atitis (skin) = a disease in which the skin is red and painful
9.	-royal = (not real) having the power but not the rank or title of a king
10.	ophilia (blood) = a rare blood disease in which blood continues to flow after a cut or other injury
11.	tope (equal, identical) = a form of an atom which has a different atomic weight from other forms of the same atom but the same atomic number
12.	-professional (similar) = a trained worker who is not a member of a profession but who assists a professional
13.	nox (equal) = either of the two occasions in the year when day and night are of equal length and the sun is directly above at the equator
14.	plus (over, above) = an amount which is more than is needed
15.	ology (sound) = the study of sounds in a particular language or in languages generally
16.	cracy (god) = the belief in government by divine guidance, a country that is ruled by religious leaders
17.	cellular (within) = located or occurring within a cell or cells
18.	psychiatry (nerve) = the branch of medicine dealing with mental disorders of the nervous system
19.	sex (single) = intended for use by both males and females
20.	biology (nerve) = the branch of biology that deals with the anatomy of the nervous system