When the atrioventricular valves open.
This is when Ventricles are being filled with blood from the atrium.
Answer:
<em><u>CERE</u></em><em><u>BROSPINAL </u></em><em><u>FLUID</u></em>
<em><u>(</u></em><em><u> </u></em><em><u>CSF)</u></em><em><u> </u></em>
Explanation:
- the clear watery liquid that surrounds the brain and spinal cord and fills the four cavities or ventricles of the brain is known as CEREBROSPINAL FLUID
hope it's helpful
The oldest fossils this is a easy one use your biology textbook and turn to the back of the book under fossils and there is your answer
Answer:
The very bottom one
Explanation:
Thymine and Adenine always pair together while cytosine and guanine go together.
