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List three objective facts about twins. Fraternal twins develop from two different fertilized ova from two different sperm; Identical twins develop when a fertilized ovum splits, and only fraternal twins can be different genders.

Facts about identical twins. (2003, May 26). Keep Kids Healthy. Retrieved October 20, 2009 at http://www.keepkidshealthy.com/twins/expecting_twins.html

List three subjective facts about twins

"Expecting parents often become indifferent" when asked if twins run in the family "after being asked it the first 40-50 times;" if twins do 'run in the family,' family members should help out, in case they themselves need the added assistance later on; families uncertain about their ability to handle twins should think twice about planning a family if twins run in the family, if they are contemplating fertility treatments, or if the mother is over age 35.

Facts about identical twins. (2003, May 26). Keep Kids Healthy. Retrieved October 20, 2009 at...
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