"dr. goddard is studying the behavioral effects of mdma (ecstasy) using a rat model. he would measure increased release of which hormones in response to mdma treatment? "

The correct answer is serotonin and oxytocin.

MDMA (amphetamine) enhances the release of  serotonin,  and/or blocks its reuptake. As a result neurotransmitter levels within the synaptic cleft are increased. Because serotonin regulates the mood, sleep, pain, its elevated levels causes the mood-elevating effects people experience.

Elevated levels of oxytocin ("the love hormone" ) increase trust, promote social bonding, and foster compassion.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.