Even though scientists have not yet discovered life on Mars, that doesn’t mean life could never exist there. The presence of water suggests that there may have been life on Mars in the past—and that life could potentially exist again. It’s possible that life may even exist there now in a very basic form. Unlike humans, plants and other organisms can breathe carbon dioxide. Some microorganisms survive in extreme cold with very little oxygen on Earth. Today, robot spacecrafts examine Mars’s surface for signs of life. Space programs like NASA are working toward a better understanding of Mars and researching a possible manned mission to Mars.

Question

Which of the following is true of life on Mars?

A
Very basic forms of life have been discovered on Mars, but not intelligent life.

B
Life has not been discovered on Mars, but there is evidence that life may have existed there in the past.

C
Life has been found on Mars, and NASA is working on a mission to study these organisms.

D
Life used to exist on Mars, but it definitely cannot exist again in the future.

Answer 1

The correct statement is:

B Life has not been discovered on Mars, but there is evidence that life may have existed there in the past.

This option accurately reflects the current understanding of Mars in relation to the possibility of past life and does not claim that life has been found or that it cannot exist in the future.