Question

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Answer 1

Answer:

1. Desert — one of the driest places on Earth. Like all living things, cacti need water to survive. ... Specialized stems allow cacti to store water for a long time.

2. the presenter arranges three pieces of card, with holes in, in an uneven line. The light stops and cannot travel through all three cards. When she arranges the holes in a straight line, the light can travel through.

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