The fact that english grammar dictates that most verbs end in-ed to indicate past tense is an example of the component of language. grammar lexicon syntax thesaurus

The answer is that it is an example of the "grammar" component of language. 

There are distinctive dialects and languages on the planet. Some are broadly utilize while some are just utilized by a little town or by a gathering of individuals. In spite of contrasts from dialect to dialect, they share some basic qualities. 
There are four zones in the study of dialect or language; these are the phonology, the grammar, the semantics and the pragmatics. Grammar is an arrangement of standards for creating legitimate correspondence. All dialects have a grammar, and local speakers of a dialect have disguised the tenets of that language’s grammar.

During the paleolithic, hominins grouped together in small societies such as bands, and subsisted by gathering  plants  and fishing, hunting or scavenging wild  animals. the paleolithic is characterized by the use of knapped stone tools, although at the time humans also used  wood  and bone tools.