I think it is D I’m not sure
no because Separation of oxygenated and deoxygenated blood in the heart of three types of animals. The three-chambered frog heart mixes oxygenated and deoxygenated blood in the ventricle. Therefore, the body never receives fully oxygen-rich blood.
<span>a.multituberculate.
hope this helps :)</span>
Around 4.1 billion years ago the first single celled organism appeared
Answer:
rock layers from different areas.
Explanation:
