My understanding is that the mention of teruma in the vidduy is to fully list the different things that had to be given. The mishna in Bikkurim says that ma'aser and bikkurim both require vidduy, whereas teruma doesn't require vidduy. The Bartenura comments on this mishna that although teruma is mentioned as part of the vidduy in the words וְגַם נְתַתִּיו, ...
I recently learned Mikvaot for the MiYodeya 10-year siyum Mishnayot and noticed artscroll there explains
The study of the [seventh chapter of Mikvaot] is considered especially
meritorious, because the first letters of the last four Mishnas spell
neshama (soul) at the end of the chapter [R Yitzchak Isaac of Komarna]. It is therefore customary to study ...
Art Scroll Gemara Moed Katan 21b2 note 14 says
As we will see later, there are circumstances when a man may remarry
within sheloshim, as, for example, when he has no children (and thus
has not yet fulfilled the mitzvah of procreation) Rashi, (from the
gemara below 23a)
Also consider the kohen gadol before Yom Kippur who must remarry in order to ...
Rashi on 21b points to the continuation of the gemara on Moed Katan 23a which provides the answer
ואם אין לו בנים מותר לישא לאלתר משום ביטול פריה ורביה הניחה לו בנים
קטנים מותר לישא לאלתר מפני פרנסתן
And if he does not have children, he is permitted to marry another
wife immediately due to the need to not neglect the mitzva to be
fruitful and ...