Thirty patients with acne volunteer to be treated with either a medicinal lotion
or a normal moisturizing cream. this type of experimental design is called
a(n)
a. in vitro observation
b. clinical trial
c. geographical cohort study
d. general population survey

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Which best example best demonstrates the importance of having knowledge of evolutionary relationships? a. illustration of a plant b. organ transplantation between species c. blood donation from a human d. do you need sequence of an insect.

Awolf pack hunts, kills, and feeds on a moose. in this interactions, the moose is a?