Natural selection is the process where the individuals with better traits survive ( in where they are ) while the individuals with less suited traits for that environment dies.
In your case, wouldn't the answer be something among the lines of "The humans with bigger jaws and more teeth found it difficult to eat or find enough food to satisfy their stomachs"? ( It makes sense. Usually, if the animal has bigger features, like mouth, and more teeth, they would need more food or nutrient to grow those bigger features. If one has bigger/more features, then that typically means they are bigger as well, which also means they need a bit more food. ^^ Yes, my logic is a bit weird, but it helps out. )
las plantas crean oxígeno que hace funcionar a todos los organismos vivos. que establece que si no creamos dióxido carbono, ellos sufrirán.
Alien technology was born With the Egyptians in 30000 bc
We have a case of adaptability. Natural selection influenced by the environment selected which plant would do the best, In this case, A has adapted better than B.