It's need to pass oxygen to the blood to the respiratory system work properly I think that the answer
Answer:
cosmic microwave background
The cosmic microwave background (CMB) is thought to be leftover radiation from the Big Bang, or the time when the universe began. As the theory goes, when the universe was born it underwent a rapid inflation and expansion.
Explanation:
Skin cell and fertilized egg cell
Answer:
Yesssss mercury Venus earth Mars Jupiter Saturn Uranus Neptune and my baby pluto
Plants use the sun and rely on themselves while animals rely on food