Examlex
Name the three layers present in three-week-old embryos and describe what each layer will later form.
Inspired Air
Air that is inhaled into the lungs, containing oxygen which is essential for the respiratory process in living organisms.
Oxygen
A chemical element with symbol O and atomic number 8, essential for respiration in most living organisms and required for combustion.
Carbon Dioxide
A gas that is clear and does not have a smell, created when carbon and organic compounds burn and through the breathing process, and taken in by plants for photosynthesis.
Pulmonary Veins
Blood vessels that carry oxygenated blood from the lungs to the left atrium of the heart.
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