If a neutral atom contains 12 neutrons and has a mass number of 23, how many electrons does the atom contain? 11
12
23
24

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

What is the mass of phosphorous in a 51-kg person

A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction