Cartoon Fossils Crossword

At a certain time one mates
to not respond due to other's mating rituals
Separation due to the physical barriers
Offspring dies before birth or if born can't survive maturity
Offspring remains healthy but are sterile and can't reproduce
No longer free exchange of alleles between the two populations
prevents mating and fertilization
reduces the viability or reproductive capacity of offspring
to change over time
the species quickly re-enters stasis with its new evolutionary adaptation
populations evolve to become distinct species