https://padlet.com/lee_huay_meng_carol/nky8u0xqn664 Why does it require more energy when climbing up the stairs? en-us 2020-03-23 05:51:51 UTC 2025-07-05 15:55:12 UTC hello@padlet.com lee_huay_meng_carol https://padlet.com/lee_huay_meng_carol/nky8u0xqn664/wish/342213421 Diagram of girl climbing up stairs.]]> 2019-03-18 01:38:11 UTC https://padlet.com/lee_huay_meng_carol/nky8u0xqn664/wish/342213421