single layer
4 - counting the cuticle, without it it is just 2
Squamous epithelial lining of alveolus Endothelial cells lining an adjuacent capillary Fused basal laminae between alveolar and endothelial cells
Fleshy leaves and thick surface layers help in keeping water inside the plant, preventing it from drying out. The cactus is an extreme example of this adaptation, made to survive in arid environments.
In humans, the epidermis is four or five cell layers thick, depending upon the area of skin in question. There is the cornfield layer, the clear layer, granular layer, spinous layer and basal layer.
2 layers
capillary walls are very thin, often a cell thick. artery walls have two thick layers.
500
3
→ layers from alveolus to capillary ①surfactant layer (inside alveolus) ②pneumocyteⅠ(typeⅠ cell) layer ③fused basal lamina (consists of basal laminae of alveolar epithelium and capillary endothelium) ④endothelium (inside capillary)
they are one cell thick.
I say thick because it's got many layers.
it is 7 layers
Alveolar-capillary membrane
1 and they are around 4 inches thick
Quite Thin, As We Have 8 Layers Of Skin.
:D
the crust is the thickness of earths layers