Which is an unreliable source?

a. a scientist who studies dinosaurs presents her research on velociraptors at a science convention.
b. an advertisement for acne medication claims it can clear up acne in less than one week.
c. an article on the centers for disease control and prevention (cdc) website discusses the salmonella bacteria.
d. a chemistry teacher discusses possible projects for the upcoming science fair.

My question says on my assignment. read the following scenarios and decide which of the properties of life are being described. the first one is. katherine stopped on the way to school to grab some donuts. 2. because a dog cannot sweat, it has to pant in order to stay cool. 3. an elephant trun had no bone but 4,000 muscles. i have no idea what i am supposed to anwer. i can't find the answer in my notes or book that i can understand anyway

What are the two main phases of a cell cycle

Which of the following are the functions of the integumentary system? yadda-yadda, the 1st answer is the brainliest. : )