Culture 29 has grown far beyond it's petrie dish and is now colonizing the entire science building.
You can.
No it won't, unless it is at the start of a sentence.
Yes. 'Thus' is another word for 'therefore'. Thus the sentence you start of with 'thus' should be an explanatory sentence.
It should start with a topic sentence.
Yes it should.
no
"In conclusion"
You start a sentence with whatever word you need to start it with. A sentence can start with "A" if it needs to. A sentence just needs to make sense.
You did a proper job of it.
No, only at the start of the sentence.
Always start the beginning of a sentence with a capital letter.
However. On the other hand.