nichts
Go on "google tear slate" but as my German teacher would say "it's nothing but a computer guessing blindly" so try a dictionary maybe a online dictionary?
nothing
It's just gem. Nothing else.
nothing he's dead
Reißen diese Mauer ab! (that's this wall, it would be die Mauer for the wall)
When you say primates, do You then mean something like cavemen? If You do, I believe that they'll tear it apart in less that two minutes.
Nothing but the day is young = nichts aber der Tag ist jung
fear nothing can be translated as "keine Angst", "mach dir keine Sorgen" or "fürchte dich nicht"
OK, is OK in German too. They tend to write it out as "okay", though.
tear from is correct.
"rasgar"