plants-tool = Wood
steam-wood = Paper
Paper-pen = Book
Human-Book = Science
Animals-Science = biology
Science-nature = physics
bacteria-biology = Reaction
Reaction-Physics = nuclear reaction
Weapon-nuclear reaction = nuclear weapon
nuclear weapon- world = THE END

I can't go on

no

no

humans-rock= tool
steel-tool= weapon
weapon-humans= hunting
hunting-birds= pen

family-family= village
Village-village= city
city-city= country
country-country= world

water-magma= rock
fire-rock= metal
metal-fire= steel
eatrh-plankton= plants
animals-plants= nature
animals-nature= evolution
evolution-animals= humans
humans-humans= family

fire-air = energy
air-water= steam
Earth-water= mud
fire-earth= magma
energy-mud= life
Mud-life= bacteria
earth-bacteria= worm
earth-worm= animals
worm-air= birds
water-bacteria= plankton