1.
One of the main points of the second paragraph
(lines 14-28) is that:
A. scientists were disappointed by the inconclu-
sive results of their experiments.

B. theories about how life developed on Earth
were shown to be flawed.

C. there was no experimental confirmation that
life existed on Mars.

D. meteorite bombardment of the Martian sur-X
face is less constant than scientists predicted.