Examlex
Lymph capillaries form a two-way system that moves lymph to and from the heart.
Active Transport
The movement of molecules across a cell membrane from a region of lower concentration to higher concentration, requiring energy.
Uric Acid
A waste product formed from the breakdown of purines, excreted in urine.
Ammonia
A compound of nitrogen and hydrogen with the formula NH3, it is a colorless gas with a characteristic pungent smell and is used in many industrial processes.
Spiders
Arachnids distinguished by their ability to spin webs using silk produced from spinnerets at the rear of their abdomen.
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