Jun Jie placed two identical grasshoppers in two different jars, A and B. Jar A was covered with a mesh wire while Jar B was sealed with a plastic lid. Both jars had wet cotton wool. After one day, the grasshopper in Jar B died but the one in Jar A was still alive. This shows that living things need __________ to survive.
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Worked Solution
Step 1: Identify the difference between the two setups (Mesh wire vs. Sealed lid).
Step 2: Mesh wire allows air to enter; a sealed lid prevents it.
Step 3: The grasshopper in Jar B died due to the lack of air.
Step 4: Conclusion: Living things need air to survive.
Correct answer: air
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