subject - school - living
Biology
immune system - immunity - antibodies
vaccine
human - number - area
population
milk - sour - white
yoghurt
play - bounce - throw
ball
wood - lead - eraser
pencil
spice - sweet - white
sugar
bed - night - tired
sleep
fruit - sweet - yellow
pineapple
sun - earth - satellite
moon
head - rest - bed
pillow
farm - fluffy - baby
lamb
bug - cocoon - leaves
caterpillar
fun - play - people
game
words - pages - spine
book
small - chopsticks - white
rice
smoke - ash - mountain
volcano
fly - airport - travel
plane
teeth - paste - clean
toothbrush
door - lock - open
key
clear - healthy - glass
water
clock - hour - minute
hand
color - sun - rain
rainbow
ocean - shell - tail
lobster