Yvette, who is 5 years old, has improved dramatically in her ability to throw and catch a baseball. which aspect of her brain development contributed most to enable these abilities by enhancing communication among the brain's various specialized areas?

The corpus callosum contributed most to enable these abilities. The corpus callosum connects the left and right cerebral hemispheres to allow communication between them. The corpus callosum helps with eye movement and attention, so this would allow Yvette to be able to concentrate on the baseball to be able to catch and throw it.