D. They had to see if this new idea fit the evidence they found in their experiments.
Answer:
False. It occurs about every 24 hours.
Explanation:
A circadian rhythm is a natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours.
The answer is B because men only have one X chromosome. Their chromosomes are xy.
I think Metamorphism changes only the shape of rocks. I'm not a 100% sure but correct me if I wrong