I've seen many people using 'consists of' as well as 'consist of' after the word 'series' interchangeably. For example:
This product series consists of features such as ...
This product series consist of features such as ...
May I know which sentence is correct, or whether both can be used? In this case, can a product series be regarded as a single entity, referred to as one category of products?
Your advice is appreciated. Thank you.
Series is the same in the singular or the plural. To differentiate you need "this" or "these".
This product series = consists of [singular - one series]
These product series = consist of [plural - more than one series]