Question

while orbiting mars, nasas mars reconnaissance
orbiter took images of the planets surface. in those
pictures, lines, like plant vines, appeared to flow down from
slopes on mars. these lines showed up during the warmer
seasons and disappeared in the colder seasons. the
discovery of the lines suggests that water exists on mars.
although mars has long been known to have ice,
researchers are sitting on pins and needles hoping more
evidence will reveal itself. water is an essential building
block for life. therefore, with this information, scientists
think that finding life on mars may be possible. however,
confirming the existence of water may take some time.
scientists have other missions already planned before
they take on finding water on mars.
3
why are the lines on the slopes of mars compared to plant vines?
○ a. to describe the harsh climate on the planet
○ b. to show how the lines spread across the slopes
○ c. to explain how plants can survive on mars
○ d. to highlight the different varieties of plants

Explanation:

The text mentions that pictures of Mars' surface show lines like plant vines, which appeared to flow down from slopes on Mars. This indicates that the lines on the slopes of Mars are compared to plant vines to show how the lines spread across the slopes.

Answer:

B. to show how the lines spread across the slopes