Even before organs begin to form, rudimentary versions of the shapes of bones begin to form in a fetus due to the
A) activity of growth hormone.
B) formation of secondary ossification sites.
C) activity of chondroblasts.
D) formation of an osteoclast.
E) breakdown of hyaline cartilage.
C
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A. G B. first law of thermodynamics C. second law of thermodynamics D. types of products E. activation energy
Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. During what season would you expect oxygen levels to be lowest in a single year?
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