Gonads: Hormonal Regulation. Sex hormones may be regulated by other hormones, by glands and organs, and by a negative feedback mechanism. Hormones that regulate the release of other hormones are called tropic hormones. Gonadotropins are tropic hormones that regulate the release of sex hormones by gonads.onads. Gonads are the male and female primary reproductive organs. The male gonads are the testes and the female gonads are the ovaries. These reproductive system organs are necessary for sexual reproduction as they are responsible for the production of male and female gametes.
A brand new Bob Books boxed set featuring 12 easy-to-read stories! Great for kindergarten and first grade readers, this boxed set includes twelve mini-books. This set is the perfect stepping stone to independent reading since it contains four level A books, four level B's,two level C's, and two level D's. Read More.
In a poll of librarians, teachers, publishers and authors, the trade magazine Publisher's Weekly asked for a list of the best children's books ever published in the United States. Hands down, the No. 1 book was E.B. White's Charlotte's Web.Now, a new book called The Story of Charlotte's Web explores how White's masterpiece came to be. One early fall morning in 1949, E.B. White walked into the barn of his farm in Maine and saw a spider web.ands down, the No. 1 book was E.B. White's Charlotte's Web. Now, a new book called The Story of Charlotte's Web explores how White's masterpiece came to be. One early fall morning in 1949, E.B. White walked into the barn of his farm in Maine and saw a spider web.