An unknown element is a element that has been discovered not too long ago.Or for say,ARE in fact located on the periodic table.When there is a new one discovered,that will be added to the periodic table as well.
Answer:
i think it's the S phase
Explanation:
During the S phase, DNA replication occurs.
D because the article says the were departed by the canyon
Lipids provide long term energy storage
It takes the Earth (approximately) 364.25 days to revolve around the sun. That's why we have leap days.
Hope that helps!