Calculate the volume of the metal required to make a hemisperical bowl with internal and external radii 8.4cm and 9.1cm respectively

Is the alien theory a scientific claim? why or why not? just took the test it was , : " the alien theory is not a scientific claim because it is not based on valid data, there is no evidence to support it, and it does not come from a reliable source."

Groups of organs that work together to complete a process in the body are called: a. cells b. tissues c. nerves d. systems

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?