Estimate the percentage of each mineral in gabbro (look the first "b" in gabbro)

What is the function of the commutator in a dc motor? a. to spin the magnet b. to change direct current into alternating current c. to change alternating current into direct current d. to spin the wire coil

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

The passage that directs air to the lungs is called a. diaphragm. b. larynx. c. bronchi. d. pharynx.