Amajor advantage of cohort studies over case-control studies with respect to the role of a suspected factor in the etiology of a disease is that:
a. they take less time and are less costly.
b. they can utilize a more representative population.
c. it is easier to obtain controls that are not exposed to the suspected factor.
d. they permit direct estimation of risk of disease in those exposed to the
suspected factor.
e. they can be done on a double-blind basis.

1. imagine that you are a prehistoric artist and write a 350 to 500 word story explaining why you are an artist and what the purpose of your art is. be clear about what time period and location you are from. you may do research about prehistoric art, but be sure to include a bibliography if you do, and credit any direct quotes you use. 2. go to an art store and purchase some clay. now using only your hands, sticks, feathers, or other natural objects, create your own statuette or primitive tool. bake it in the sun or in a fire. if you can find natural pigments, you may color your work. take a digital photo of your finished work and send it in. use complete sentences and cite all of your resources.