Please choose the correct answer to the question: Studies of snail fossils in Egypt indicate that areas of Egypt that are now desert were once thriving savannahs approximately 130,000 years ago. What does the presence of these fossils indicate about the area of Egypt that was thriving 130,000 years ago?

Answer1: There was more humidity in the air. Answer2: There were fewer nutrients in the soil. Answer3: There was more snowfall in the region. Answer4: There was less solar radiation in the region.

Answer format: answer1/answer2/answer3/answer4
Answer: answer1