Bright colors such as flowers or light green bushes/trees would result in an decrease in a blackbirds population because the blackbird wouldn't be able to blend into its environment due to the dark color it has, allowing many predators to spot it. So brighter colored environments would result in the decrease of the blackbird population.
No one cares how smart you are and the questions you ask why would ask this on a good website for answers when your so smart you can ask good questions but not answer it.
The hormone that stimulates ovaries to release one egg per ovarian cycle is called follicle-stimulating hormone (FSH). This hormone is produced in the pituitary gland. Most woman will reach puberty by their teen years.