E-mail, texting, and social media have largely replaced

Answer

Hand written letters

Explanation

In the current world, people have shifted from the traditional ways of sending messages such as letter writing into the digital methods of sending messages. These new methods are text messaging using mobile phones, utilizing of social media platforms to communicate both by text and images and the utilization of e-mails in business/work  related  communication.

i'm sure the answer you are looking for would be

a. an ice age

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the answer you are looking for is relatively steep.

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