Squamous cells area one single layer and flattened, this allows for diffusion of oxygen and carbon dioxide to happen easily in the lungs.
The answer is “it is the gap between neurons” and “it ensures that information travels in one direction only.”
Please rephrase the question, it doesn't make sense.
Domain is the most inclusive of the three, genus is the least inclusive
I think the veins absorb the photons because they're located at the top part of a leaf while the stomata that serves as the leaf's lungs are found at the under side.