Answer:
hydrogen and helium couldn't form until the universe had cooled enough to allow their nuclei to capture electrons, about 380,000 years after the Big Bang. Within about 3 minutes after the Big Bang, conditions cooled enough for these protons and neutrons to form hydrogen nuclei.
Explanation:
hope this helps
I do think that they close to not allow too much of either water or air from entering.
the hollow tube allows water to flow easily.
https://www.bbc.co.uk/bitesize/guides/z28g7p3/revision/1
Answer:
C the oceans
Explanation:
Throught history humans have used the ocean- technological advancments came far later
Into the human digestive system, mucus is used as a lubricant for materials that must passover membranes e.g, food passing down the esophagus. A layer of mucus around the inner walls of stomach is vital to protect the cell things of that organ from the highly acidic environment with in it.