There are many:
- Primarily, it is a process which is solely up to the female (the whole "it's my body" rhetoric)... The man is half the equation of making a child and is seemingly excluded from the process entirely...
- It is an organism that does not have the voice to actively be a part of the decision making, it can be a very barbaric process...
- It is a procedure that can be abused by halfwits that think the pull out method is an effective form of contraception... Honestly, people in this world need to understand that the actions you undertake have consequences... The killing of an unborn child should not be practiced because of a persons stupidity...
- Then there is the whole rape rhetoric... The lynch pin many feminists like to use to justify abortion... Hardly a strong argument, considering less then 1% of abortions in the United States were because of rape...
http://www.nytimes.com/1989/10/13/us/rape-and-incest-just-1-of-all-abortions.html
there's many more...