Puberty occurs when a part of the brain called the hypothalamus begins to produce a hormone (gonadotropin) that has an effect on the testes and ovaries causing an increase sex hormone — estrogen in girls and testosterone in boys.
<span>The Hellenistic (Greek) mathematician who invented the compound pulley and is known for his work with the laws governing simple machines was C. Archimedes.</span>
C.) trial by jury of peers
