Ethos is a way an author appeals to the reader/viewer. It is one of the 3 appeals...Ethos, Pathos and Logos
Ethos is based on credibility and building trust...so we are looking for facts or things that would make the author worth listening and a credible source.
Example:
Dentists across the world trust and use this toothpaste.
The fact that we know that dentists are endorsing this product adds to the appeal and credibility...it turn we trust it.
Answer:
Based on the current theories and research on the sexual division of labor, four critical aspects of hunter‐gatherer socioecology led to the evolutionary origin of the SDL in humans: long‐term dependency on high‐cost offspring, optimal dietary mix of mutually exclusive foods, efficient foraging based on specialized skill, and sex‐differentiated comparative advantage in tasks.
In the early 1900s progressive era reformers sought to increase citizen participation in government by supporting the the process of electing the US senators directly. It was during this progressive era period that huge amount of social and political reforms took place across the United States of America. The actual or rather the reason behind this movement was the eradication of corruption in the ruling government. The target of this movement were mainly the corrupt political leaders that were misusing the power given to them.