Examlex
An adaptation that is designed to solve a particular problem is called a(n) _________.
Endocrine Gland
Endocrine system glands that secrete hormones directly into the bloodstream to regulate different body functions.
Epithelial Surface
The layer of cells covering the surfaces of the body, including the skin, organs, and internal passageways.
Bloodstream
The flowing blood within the circulatory system of the body, transporting oxygen, nutrients, and waste products.
Collagenous Fibers
Strong, flexible fibers made of collagen that are a major component of connective tissue in the body.
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