底棲生物

底 = 广 + 氐 : The space station's old concrete foundation has been broken up, and Dorothy Gale wants to send the remnants of the foundation back to the base on earth using parachutes.

栖 = 木 + 西 : The Queen of Hearts (qi) set up an artificial habitat (栖) in front of the space station (Ø1) by using a huge cowboy hat (西) as the base on which she erected a few Christmas trees (木).

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.