question: most people are in one way or another the victim of "possession", which they do not think of under this name.
Capitalize this past sentence correctly.
A: Most people are in one way or another the victim of "possession", which they do not think of under this name.

question: strip trio sl: vibrant look fast to install.
Capitalize this past sentence correctly.
A: Strip Trio SL: Vibrant look fast to install.

question: there are many such instances, which justify us in believing that organisms of several kinds can result in a successful amalgamation.
Capitalize this past sentence correctly.
A: There are many such instances, which justify us in believing that organisms of several kinds can result in a successful amalgamation.