It was revealed during the presentation that the scientist had no Earthly idea of what their research could possibly mean.
You can use "substantial" in a sentence like this: "The research revealed a substantial increase in the population of endangered species over the past decade." This indicates that the increase is significant or considerable in size or amount.
A scentence for unlikely is: He has a good reputation for being a liar, so it is unlikely he is telling the truth this time.
however
Maybe because, what if the word also is the first word of the scentence. You also don't use it when you have a scentence like: I also like bananas and strawberries. What I mean is, is that it depends on the scentence.
its Thirty-fifth if in the middle of a scentence and it's Thirty-Fifths if it's the beggining of a scentence
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You don't.
I talked earnestly.
a sentence is a long word thingy
Scientists have split the atom.
we all had a separate alcove
The invention of the wheel was a revolution.