Which sentences are punctuated correctly?

1.some workers train dogs to become service dogs for people who need assistance others workers accompany the mobile spay and neuter project for inner-city pet owners.
2.that's the other thing i learned: being active is just as important as eating better foods.
3.over the years, many of us have read the words of henry b. adams: “a teacher affects eternity; she can never tell where her influence stops."
4.you know the feeling. it's minutes until the school bus comes, but you just rolled out of bed, threw on some clothes, barely brushed your teeth, and now you’re racing out the door to catch the bus.

The answers are 2 and 3.

 Sentence 2: One of the uses of the colon is to introduce an item or a series of items. These items, after the colon, are written with lower case. "Thats the other thing I leaned: being active..."

Sentence 3.  If a quotation contains two or more sentences, we use a colon.  The two independent clauses in the quotation are connected by a semicolon.

depends on your school

when i was in high school i took ap biology my senior year and it was the hardest one for me because my teacher finished the material within the first month of school and then went on to doing advanced college level it was horrible. but at a nearby school ap biology was one of the easier aps. also, it depends on what you are interested i like math a lot so ap calculus was easier for me than most but i hate history so ap us government was harder for me than most.

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