4. Dr. Sayer is studying how our perceptions of attractiveness have changed over time. He hypothesized that, due to increased concerns over skin cancer, tan skin is perceived as less attractive now than it was 20 years

ago. He compared data from 1987 to current data and found that, on average, tan skin was rated as 4.2 in

attractiveness (on a scale of 1-5, with 5 being most attractive) in 1987 as compared to 3.7 today. In

analyzing these results, what three factors must Dr. Sayer consider when determining if these averages are

reliable?

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card

because growing process had stoped after 4-5 year

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.