What do they need to do to determine what time period eocene belongs to on the geologic time scale

They need to scan a chart on the internet and you know when you find it.

There are certain steps taken by the professionals in order to know more about a certain civilization inside the history of man kind, as there archaeologist and other research workers who digs deep inside the ground and explores the different artifacts which are possibly there to be analyzed by the professionals and then the prepare the different documentations to keep a record of each civilization that existed in a certain period of the planets history.

28. evolution

29. environment, survive, offspring  

explanation:

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.