The greenhouse effect is the trapping of a stars warmth in the lower atmosphere of a planet by gasses in the air trapping the energy. This is similar to what actual greenhouses do, where they trap the warmth and humidity of the air inside it so plants can flourish. Farm animals produce a huge amount of the greenhouse gasses required for our planet to trap the suns warmth.
The matching DNA strand would be A - T, G - C, A -T, A - T, C - G, or in other words TCTTG (because you had the strand AGTAAC).
Always remember that A pairs with T, G pairs with C, T obviously pairs with A, and C obviously with G.
Colonial species are together
I believe it's false. The nucleus is the control center of the cell. The mitochondria is commonly known as the cell's powerhouse.