Which terrestrial ecosystem or life zone produces the highest net primary productivity per year? a. temperate forest b. savanna c. tundra d. swamps and marshes e. extreme desert

“other instruments such as gravimeters and magnetometers are also used in the search for petroleum. extracting crude oil normally starts with drilling wells into an underground reservoir. when an oil well has been tapped, a geologist (known on the rig as the "mudlogger") will note its presence. “ this is what i found on google i hope it

Since the pully is a simple machine so the mechanical advantage is a 1