What is the force on a 1,000-kilogram elevator that is falling under the acceleration of gravity?

Which one of the following research methods can show cause and effect

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system