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Epithelial cells have a polarity dealing with transport.
Water
A transparent, tasteless, odorless, and nearly colorless chemical substance that is the main constituent of Earth's hydrosphere, and the fluids of most living organisms.
Life Forms
The various organisms that inhabit the Earth, encompassing diversity in physical structure, habitat, and life processes.
Cells
are the basic building blocks of all living organisms, ranging from single-celled bacteria to complex multicellular humans.
Internal Structures
The organization or arrangement of the parts inside a system, body, or object.
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