What substance(s) cause(s) the ovaries and testes to greatly increase their production of estradiol and testosterone?

Gonadotropin releasing hormones causes the ovaries and testes to greatly increase their production of estradiol and testosterone.
Gonadotropin releasing hormone is a hormone is released from nerve cells in the brain or produced in hypothalamus and transported to the pituitary gland through the blood stream. These hormones are very important in fertility.

Nimbostratus is the correct answer.
explanation: nimbostratus clouds are the type of clouds that are mostly likely present on gray, rainy day. these clouds produce continuous rain, snow and there is no thundering or lightening either.