adaptation
alleles
animal
bark
birch
bird
biston betularia
black
change
chromosome
color
colored
cross
dark
darwin
difference
dominant
drosophila
education
evolution
form
gene
hybrid
illustration
industrial revolution
insect
isolated
kingdom
lichen
light
melanic
melanism
moth
mutation
natural
parents
pepper moth
phenotype
pollution
population
predation
process
science
selection
smoke
synthesis
tree
wings
withe