Unoxygenated blood from veins enters the right atrium then it goes down to the right ventricle then out through the pulmonary artery to the lungs where it becomes oxygenated blood which then enters the heart through the pulmonary veins and it goes to the left atrium and then is pumped down to the left ventricle and out through the aorta to the arteries where it travels to different organs and becomes deoxygenated and then the cycle repeats itself.
Short Answer
Explanation:
The cell cycle is a cycle of stages that cells pass through to allow them to divide and produce new cells.
Answer: I believe it should be the Mitochondria.
Explanation:
The answer is a. notochord.
The notochord develops along the back of the embryo. It derives from the endoderm during the gastrulation. It extends along the anteroposterior axis of the embryo.
Among the other choices, a zygote could not be the right answer because an embryo eventually develops from the zygote. A dorsal fin is not along the whole back of the embryo, and gill slit is usually on the side of the shark head.
