生物降解

生 = 牛 + 一 : Mnemonic symbol: a cradle.

Sherlock Holmes (sh) comforts a crying baby bull (牛) in a cradle (生) in front of the engine ((e)ng1) and plays him a tune on a flute (一).

物 = 勿 + 牛 : Willy Walrus (w) wants to become a physicist (物) and does research about dark matter (物) in the space station's bathroom (Ø4). His motivation is to become a super villain and rule the world. Just as he is about to have a breakthrough, a huge black ox (牛) flying with the help of bat wings (勿) hits Willy with an oxerang and takes away the dark matter, saving the world.

降 = 夅 + 阝 : Shortly after Jin Xing descended down from the heavens to visit Joan of Arc in the anglepod's bathroom, the Pope follows and descends from another heaven. He messes up the landing though and lands on Jin Xing, which in turn falls on the Joan of Arc.

解 = 刀 + 牛 + 角 : Mnemonic symbol: acetone, in which anything can be dissolved.

Inside of the elevator (e3) Joan of Arc (ji) is dissolving a horn (角). A moment ago she cut the horn from the bull's (牛) head using a cleaver (刀). The bull is still shocked as he sees Joan of Arc dissolve (解) his horn in acetone (解).