Convection in the mantle is the answer
Lack of an increasingly broad spectrum expertise and resources.
Answer:
Genetic drift is the change or mutation in the gene pool over generations. It can take several generations for a genetic drift to take place in a community. But if the population of that generation is smaller, there are higher chances that the genetic drift would occur over the next very generations. Any mutilations that disrupts the natural course of genetic transfer can cause genetic drift to take place in those species.
To fight overweight and obesity. Our weight and habits will affect how we perform in school. Even more schools have to follow the laws and if a law is passed that requires schools to implement healthier food they will have to abide.
Child directed speech is the unique way that parents (and others) talk to babies.