1 Sulfur Crystals: History and its Uses Sulfur is a chemical element that is widely abundant in nature. 2  It is classified as a multivalent non-metal. 3  Sulfur's symbol is S and its atomic number 16.
Question and answer. The __________ and __________ are the glands that stimulate reproductive cycles. A. testes. . . thyroid B. testes. . . ovaries C. ovaries. . . thyroid D. ovaries. . . thymus. The testes and ovaries are the glands that stimulate reproductive cycles. Expert answered| emdjay23 |Points 2484|.
1 Testes: The male reproductive glands that produce sperm and sex hormones. 2  Thymus: A gland in the upper chest that helps develop the body's immune system early in life. 3  Thyroid: A butterfly-shaped gland in the front of the neck that controls metabolism.