Answer: Scientific theories are always testable. A theory may be changed as a result of new observations.
Las teorías científicas son siempre comprobables. Una teoría puede ser cambiada como resultado de nuevas observaciones.
Explanation: The scientific method requires that all theories have to be testable in some way. Theories can be improved or modified as more information is gathered.
Scientific theories are always changing. A theory may be changed as a result of 'new information' (Im not sure about the last one, but I think its something around that.
