A nondrug substance made to look like a real drug
A) Ecosystem
B) Informed consent agreement
C) Epidemiologic studies
D) Critical thinking
E) Homeostasis
F) Metabolism
G) Placebo
H) Theory
I) Hypothesis
J) Adaptive trait
G) Placebo
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What gene in humans prevents male development?
A. SRY B. DAX1 C. SOX9 D. SXL
The eukaryotic cell membrane is a bilayer of sterols.
Answer the following statement true (T) or false (F)
How could the number of coexisting species within a community be increased?
A) increased total niche space (variety of resources) B) increased niche overlap C) increased specialization D) A, B, C, or any combination of these
Which of the following is the best interpretation of the graph below of mussel size (x-axis) versus energy gain (line graph, left y-axis), and number of mussels eaten per day (histogram, right y-axis)? 
A. Crabs select mussels in a way that maximizes their energy gain. B. Mussel size does not seem to be a good predictor as to which mussel hungry crabs will select. C. Crabs prefer the mussels with the smallest length for their food resources. D. Mussels are selected as food sources by crabs. E. Crabs tend to consume most of the largest mussels.