What conditions in the nucleus are likely to result in an atom undergoing radioactive decay

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

Which sound characteristic is not affected by the relative motion of an object