Valves ensure blood flows toward your heart. Vein valves work to bring the blood that flowed down via arteries back up to your heart.
Water, which is a chemical compound of hydrogen and oxygen in the ratio two hydrogen atoms for every oxygen atom, contains H2O molecules.
Answer:
translation
Explanation:
Translation takes place at a ribosome in the cytoplasm. During translation, the genetic code in mRNA is read to make a protein.
Answer:
D, over the past Billions of years, our atmosphere has formed to protect life.
