A stroke can result in a number of visual problems, including visual neglect, decreased visual acuity, diplopia (double-vision), squint, and homonymous hemianopsia (visual field defects).
Natural Selection. Natural selection is the process by which individuals with characteristics that are advantageous for reproduction in a specific environment leave more offspring in the next generation, thereby increasing the proportion of their genes in the population gene pool over time.
Examples Of Natural Selection. Natural selection can be defined as a process where the organism that is able to survive will pass on the beneficial traits to its offsprings because these traits are the best suited for the environment. When the offsprings are able to survive successfully, they increase in numbers.