I believe it is D) He showed that DNA is a transforming factor.
because,
Humans DO have DNA
Viruses DO have DNA
Traits CAN be inherited
so the only one left is D)
Because the baspar in every dna is different
answer:
By altering the light factor
Explaination:
Blood levels of the pineal hormone melatonin are high at night and low during the day. Its secretion is controlled by a rhythm-generating system located in the suprachiasmatic nucleus of the hypothalamus, which is in turn directed by light. So by designing a control in which the intensity or duration of light is altered to regulate this cycle.