Culture 29 has grown far beyond it's petrie dish and is now colonizing the entire science building.
You can.
Yes, "Hiking" should start with a capital letter in a sentence because it is a proper noun.
Culture plays a significant role in shaping individuals' values and beliefs.
Yes. 'Thus' is another word for 'therefore'. Thus the sentence you start of with 'thus' should be an explanatory sentence.
Yes it should.
It should start with a topic sentence.
Radiation should not be capitalized unless it appears at the beginning of a sentence or is part of a proper noun, like "Radiation Therapy Unit."
"In conclusion"
no
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.
No, only at the start of the sentence.
No, unless it is the first word of a sentence or part of a proper noun.