Should we use the singular or plural form in the following examples?
1- Performing the majority of daily activities requires the ability/abilities to read and write. (Ability sounds more natural to me, but technically speaking, we are talking about two abilities here: the ability to read and the ability to write.)
2- Getting literate even in later stages of life can enhance the sense/senses of happiness and fulfillment. (Similarly, sense sounds more natural to me, but senses sounds more grammatical.)