Final answer:
A spay can be performed on a pregnant animal, and this is indeed true. The procedure will terminate the pregnancy and is considered based on animal health and pregnancy stage. Also, fetuses can produce urine, while the umbilical artery actually carries deoxygenated blood away from the fetus.
Step-by-step explanation:
True or False: A spay can be performed on a pregnant animal. The answer is true. A spay, which refers to the surgical removal of the ovaries and uterus of a female animal, can be performed on an animal that is pregnant. However, this procedure will result in the termination of the pregnancy.
The decision to spay a pregnant animal is typically based on several factors, including the health of the animal, the stage of pregnancy, and the circumstances that necessitate the surgery. Regarding the provided reference information, fetuses can indeed produce urine. And for the umbilical artery, it actually carries deoxygenated blood away from the fetus towards the placenta, where it gets oxygenated.
As for postzygotic barriers, these are mechanisms that operate after fertilization to ensure that the resulting hybrid offspring are either not viable or fertile. Therefore, an incorrect statement about postzygotic barriers could be one implying that they prevent fertilization itself—that would be a prezygotic barrier instead.