While I disagree with him on many areas of theology, in the following video, Jimmy Akin does a good job at refuting a popular proof-text used by pro-abortion (so-called "pro-choice") advocates (Num 5:11-31) to support murdering unborn children in the womb:
Akin's colleague at Catholic Answers, Trent Horn, has a great book which I recommend on the topic of abortion, Persuasive Pro-Life: How to Talk about Our Culture's Toughest Issue (2014).