33. which stimulus tests the absolute threshold of vision?
a) hair cells of the inner ear
b) electromagnetic energy
c) chemical substances in the air
d) a ticking watch in a quiet room
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As a result of these processes the single celled organism accomplishes

What process occurs during cellular development as the cell changes into a specific type of cell with specialized functions? a. binary fission b. fusion c. differentiation d. meiosis

On a spring day, a middle-latitude city (about 40? north latitude) has a surface (sea-level) temperature of 10 ? c. if vertical soundings reveal a nearly constant environmental lapse rate of 6.5 ? c per kilometer and a temperature at the tropopause of –55 ? c, what is the height of the tropopause?