1 valence electron is present.
The answer you are looking for is chloroplast
Answer: When the ball reaches the highest point and stops briefly.
Explanation: All thrown projectiles make a parabola, the peak of the parabola will have the greatest gravitational potential energy.
The LEFT VENTRICLE of the heart supplies oxygenated blood to the aorta.
Aorta is the main artery that supplies oxygenated blood from the heart to other organs and tissues (except lungs, lungs are for gas exchange instead) so that they get enough oxygen and nutrients.
Meanwhile, the heart has 4 chambers, left and right atrium, and left and right ventricles. Atrium are for receiving blood from different vessels, and ventricles are for pumping blood out of the heart.
Since only the left ventricle is connected to the aorta, so, the answer should be left ventricle.
Reference picture by amac training.