Discussion
Consider the two statements and choose the correct option :
Statement (A) : Sahara once used to be a lush green plain.
Statement (B) : Cave painting in sahara depicts rivers, crocodiles, elephants, lions, cattle and goats.
Answer: C
Both (A) and (B) are true.
The NCERT chapter on the Sahara desert says that the Sahara was once a lush green plain. Cave paintings in the Sahara show that there were rivers with crocodiles, and that elephants, lions, giraffes, ostriches, sheep, cattle and goats were common animals there.
The paintings are in fact the evidence for statement A: animals that need water and grassland could only have lived there when the climate was wetter. So neither statement is false, which rules out the three options that call one or both of them false.
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