All of the following show friction as a useful force, except
the heat energy produced when two surfaces rub together
having to push a rough and heavy box across the floor to move it
the friction between your feet and the floor keeping you from slipping
the tread on tires helping the moving vehicle slow down and stop when necessary
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Indica el nombre y la fucion de los vasos sanguineos que entran y salen de los riñones

Plz fast biotechnology is a growing field of applied biology. many crops such as corn have been engineered to be resistant to herbicides. therefore farmers can spray these chemicals to kill weeds growing near the crop without worries of killing the crop itself how does this type of biotechnology work? a. by changing the genetic make up of the crops. b. by causing the crops to kill the weeds. c. by changing the type of crops used. d. by changing the location of the crops.

The fruit of a certain plant is sweet and fleshy. the seeds of this plant have a seed coat that is fairly tough. the seeds germinate better if they are exposed to acid, or scarification. what is the most likely type of dispersal for this seed? water animal wind