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Active Transport
The movement of substances across cell membranes against a concentration gradient, requiring energy.
Passive Transport
The movement of ions and other molecular substances across cell membranes without the need for energy input.
Sieve Elements
Specialized cells in the phloem of vascular plants that are involved in the transport of sugars and nutrients.
Sink Cells
Cells that act as a metabolic or storage sink, usually absorbing and storing nutrients transported from source cells in an organism.
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