Extrusive rocks that cool quickly have: a. fine grains or no crystals
c. large or coarse grains
b. small and large crystals
d. a clear appearance
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Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.

All ova contain sex chromosomes corresponding to: x y xx xy