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These include placenta previa , a condition in which the placenta is attached too low in the uterus and covers part or all of the cervix ; and placental abruption , in which the placenta separates from the uterine wall before delivery . However , in 1998 Russia signed a bilateral treaty with Kazakhstan , in which the latter 's right to its subsea resources was recognized , while joint control of water surface was agreed upon . The following letter , in which a detective asked for a job hunting Spanish spies in Florida , along with Bloxham 's brief , yet polite reply , is an example of the many issues with which the governor had to contend . The Democrats use a proportional system , in which the percentage of party members in favor of a candidate in the primary or caucus is reflected in the percentage of delegates representing that candidate who will be sent to the convention . The most common of these is spina bifida , in which the spine is not closed . The aggressive moves against spam may also reflect a changing demographic at MySpace , in which the percentage of users between 14 years old - - the minimum age required to establish a MySpace profile - - and 24 years old has dropped from more than 40 percent in 2005 to less than 34 percent last year , according to figures from comScore Networks .