Question

question 1
1 pts
the term ____________ refers to two or more sires causing a single gestation. this is common in species, such as dogs that have litters.
polyparental
superfetation
superfecundation
polyspermatic

question 2
1 pts
mares usually ovulate
24 hours before the end of estrus.
24 hours after the end of estrus.
midestrus.
at the onset of estrus.

Explanation:

For Question 1, superfecundation is when multiple sires contribute to a single gestation, common in species with litters like dogs. Polyparental is not the correct term here. Superfetation is the fertilization of a new oocyte during an existing pregnancy. Polyspermatic is not the right term for this concept.
For Question 2, mares usually ovulate 24 hours before the end of estrus. This is a well - known fact in equine reproductive physiology.

Answer:

Question 1: C. superfecundation
Question 2: A. 24 hours before the end of estrus