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General

General nature or nature terms.

Industry: Natural environment

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General

secondary xylem

Biology; General

Xylem produced by the vascular cambium in a woody plant stem or root; wood.

sperm

Biology; General

The male gamete.

spermatogenesis

Biology; General

The development of sperm cells from spermatocytes to mature sperm, including meiosis.

sapwood

Biology; General

Layers of secondary xylem that are still functional in older woody plants; visible as the outer lighter areas in the cross section of a tree trunk.

second law of thermodynamics (entropy)

Biology; General

The energy available after a chemical reaction is less than that at the beginning of a reaction; energy conversions are not 100% efficient.

spicules

Biology; General

Needle-shaped skeletal elements in sponges that occur in the matrix between the epidermal and collar cells.

spinal cord

Biology; General

A cylinder of nerve tissue extending from the brain stem; receives sensory information and sends output motor signals; with the brain, forms the central nervous system. Nerve cell collections ...

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