Answer:
1. a
2. b
Explanation:
I'm sorry I know only these 2 :)
Answer:
The first line of defense involves skin.
Answer: it is my cute sister
Explanation:
Answer:
1) Liquid hydrogen has the lowest density of any liquid.
2) Hydrogen is the chemical element with the symbol H.
3) Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass.
4) Atomic mass: 1.00784 u
5) Atomic number: 1
