Plz help this is for english

Which would be the most credible source for researching the effects of smoking? letter from your grandfather web page about someone’s lung cancer report prepared by a tobacco company research article in a scientific journal

Constructed response paragraph: after reading “the case for short words,” do you think the author makes a convincing case that short words are effective? explain your answer and support it with evidence from the selection.

Jeff's response to justin assumes that justin is following which maxim? justin: hey, jeff! jeff: yeah? justin: get ready for the news of the day! jeff: okay. justin: i got that job i was after! jeff: wow! that's great! justin: ! starts right now! later!