Aconstruction worker is using his weight to keep a stationary stack of wooden beams from falling. if the construction worker uses 689.0 n of force to hold 10 beams stationary against a wall, how much work does he do?

a: 0 j
b: 0.0150 j
c: 68.9 j
d: 6,890 j

quickly plz

The phylogeny chart shows the evolution of camels. camelus is the modern-day camel. based on this chart, which three statements are true? ⭕ modern camels are more related to stenomylus than to eschatius. ⭕ stenomylous and modern camels do not share a common ancestor. ⭕ modern camels are more related to camelops than to aepycamelus. ⭕ pliauchenia and oxydactylus may share similar features. ⭕ procamelus and stenomylous may share similar features.

Depending on the organism the number of in a cell may change

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?