In the "Meteorite" AL 84001,recovered from Antarctica and Traced to an Origin

Multiple Choice

In the "meteorite" AL 84001,recovered from Antarctica and traced to an origin on Mars,which of the following,indicating the possibility of life on that planet,has NOT been found?

A) Rounded grains of carbonate minerals,which can be produced by life forms
B) Magnetite and sulfide compounds,found together in carbonates,a sign of bacterial action
C) Enclosed pockets of carbon dioxide (CO₂) and methane (CH₄) ,which were most likely produced by life forms
D) Elongated tube-like structures,resembling fossilized microorganisms