The first crossword solution for the term 'MONKEY' is RHESUS, a species of Old World MONKEY native to parts of South and Southeast Asia. The RHESUS MONKEY is one of the most widely known species of non-human primates, and has been used extensively in scientific research. The second crossword solution for the term 'FACTOR' is RHESUS FACTOR, which is an antigen found on the surface of red blood cells. It is used in blood typing to determine whether a person is Rh positive or Rh negative. People with Rh positive blood have the RHESUS FACTOR antigen, while those with Rh negative blood do not.