Yes.
Yes, they can and have in the past.
Infertile or barren.
No. If a woman is infertile, sperm will have no effect on her. Infertile means she cannot get pregnant.
There are so many different things, and something that will make one person infertile will not affect another. Some people are born infertile and often there is no apparent reason.
Infertile also means unproductive or barren.
No, not all female werewolves in Twilight are infertile. In the Twilight series, it is mentioned that female werewolves may have trouble conceiving due to the physiological changes they undergo, but it is not a definitive rule that all female werewolves are infertile.
Yes, I'm afraid so, anyone can be infertile.
Squirrelflight is not infertile. She and Bramblestar have kits together in the Warrior Cats series.
Twin heifer calves being infertile is not a common occurrence. If they are healthy and growing normally, there should be no issues with their fertility. However, it's always best to consult with a veterinarian for a more accurate assessment.
Infertile soil or land can be solved through the practice of bush fallowing.
No