Answer:
1.Atria push blood into the ventricles
2.Venticles push blood out of the heart.
<span>Nuclear provides over half of low-carbon electricity.
</span>Nuclear power<span> plants currently operate in 31 </span>countries, from which most of them are in Europe. The statement that e<span>astern Europe uses nuclear energy for electricity production at a higher proportion compared to other parts of the world is true.</span>
The spinning of Earth on its axis is Earth's rotation.
The biome that is characterized bylow temperatures, permafrost, and little precipitation is the tundra. 2) Thelatitude is the factor that explains why tundra biomes remain cold year round but taiga biomes have alternating warm and cold seasons.
