A fissure or crack in the wall.. would be the correct answer.
Answer:
The pressure differences on either side of the valve.
Explanation:
The heart valves open and close passively because of pressure differences on either side of the valve. When pressure is greater behind the valve, the leaflets are blown open and the blood flows through the valve. However, when pressure is greater in front of the valve, the leaflets snap shut and blood flow is stopped.
Hope this helps!
have a blessed day
Answer:
D. carbon dioxide
Explanation:
Plants need CARBON DIOXIDE and water to produce oxygen and glucose.
Answer:
Correct!
Explanation:
September 2, 1939
By this time Stalin invaded Germany and burned Berlin and Hitler killed himself leading to the occupation until 1989. Personally, I think Germany started losing the war on September 2, 1939 (that's the day after Germany invaded Poland by the way).