two
4 - counting the cuticle, without it it is just 2
In bacteria, the cell wall is composed of peptidoglycan, and is essential to the survival of many bacteria. Bacteria have been classified into Gram-positive and Gram-negative based on the structure of the cell wall. Gram-positive bacteria possess thick cell wall consisting of many layers of peptidoglycan and teichoic acids. Gram-negative bacteria have relatively thin cell wall consisting of few layers of peptidoglycan.
The main part of an onion, the thick layers, can have many layers of cells stacked on top of each other. Between the layers, there is a thin skin (onion skin) which is a single layer of cells. The single layer makes it easy to for a student to study the cell structure under a microscope.
Oxygen diffuses through two layers of cells: the alveolar epithelial cells lining the lung air sacs and the capillary endothelial cells before it reaches a red blood cell in the pulmonary capillaries.
A blastula typically consists of a single layer of cells called the blastoderm. This layer forms during early embryonic development and surrounds a fluid-filled cavity called the blastocoel.
there are 2 layers. one for each side. like a sandwich and the layers are the bread. there are two of them so they can hold together the inside :]
there are 2 layers. one for each side. like a sandwich and the layers are the bread. there are two of them so they can hold together the inside :]
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forty-six layers
2 layers of lipids.
71 microscopic layers
2 layers
3
there are three
Three
2
4 - counting the cuticle, without it it is just 2