When did scientists come to realize how the atoms and molecules on the Earth mostlikely combined to make living things

A．the history of computers
B．the different functions of computers
C．the computer in the 21st century
D．scientific breakthroughs in the 21st century

A．computers can not yet tell us what symptoms a patient has
B．computers now can remind you to turn off the lights in the basement
C．the author has a car that can think for itself
D．some computers now can already make loud complaints