Hyperbole, you can't think of something a billion times a day.
The way you know the subject of the sentence is plural is because it takes a plural verb. You can see that the subject of the sentence is <em>the ova </em>(plural for of Latin word <em>ovum</em>, <em />meaning egg cell), and the verb it takes is <em>undergo </em>(plural)<em>, </em>and not <em>undergoes, </em>which would be singular.
1. The race, therefore, was equally challenging to all the contestants.
2. Are you going to join us for tea, Mrs. Collins?
3. The rowers, of course, were exhausted after the three-hour race.
They collect the stones and put them in piles
