What structure in the brain controls the chemical responses that signal the sex hormones to make us either male or female? a) All of these
b) The pituitary
c) The RAS
d) The adrenals

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs