People have grown completely immune to smallpox, meaning that the vaccine has done it's job and is no longer needed.
1.) Organisms are producers when they can make their own food.
2.) If one species in the food web ceases to exist, one or more members in the rest of the chain could cease to exist too. Such as plants, if they didn't give off oxygen and all plants/ trees didn't exists humans would go extinct because we need air to survive.
3.) They would be affected due to the changes that are happening within the city. (I'm not sure on this one)
The corpus callosum is a broad band of white matter. It connects both left and right cerebral hemispheres to allow communication. Also, it allows relaying of information to both hemispheres in order for the brain to function in a healthy way.
Crossing over is the exchange of chromosome segments between non-sister chromatids during the production of gametes.
