Answer:
We are made of primitive cells
252 Ma<span> (million years)
Please give brainliest
</span>
Answer:
The length of daylight and nighttime would decrease.
Explanation:
If 24 hours was decreased to 20, it would shorten night and day time.
Your heart muscle needs its own supply of blood because, like the rest of your body, it needs oxygen and other nutrients to stay healthy. For this reason, your heart pumps oxygen-rich blood to its own muscle through your coronary arteries.
