A synonym of "gradual" can be...

Extending or reaching throughout the world...

What is a synonym of "choose"?

One part of a situation, problem, subject, etc.:... (a.....)

What is the action of finding the similarities between two things?

Reduce the amount or quantity of something..

Following or belonging to the customs or ways of behaving that have continued in a group of people or society for a long time without changing.... (t.....)

To no longer exist... (d....)

What is the meaning of "still"?

A synonym of "alternative" can be...

To guess or calculate the cost, size, value, etc. of something...