General

General

General nature or nature terms.

Industry: Natural environment

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General

secondary cell wall

Biology; General

In woody plants, a second wall inside the primary cell wall; contains alternating layers of cellulose and lignin.

skeletal system

Biology; General

One of eleven major body organ systems in animals; supports the body, protects internal organs, and, with the muscular system, allows movement and locomotion.

symbiosis

Biology; General

An interactive association between two or more species living together; may be parasitic, commensal, or mutualistic. The relationship between two organisms.

skin

Biology; General

One of eleven major body organ systems in animals; the outermost layer protecting multicellular animals from the loss or exchange of internal fluids and from invasion by foreign microorganisms; ...

sympathetic system

Biology; General

The subdivision of the autonomic nervous system that dominates in stressful or emergency situations and prepares the body for strenuous physical activity, e.g., causing the heart to beat faster.

secondary compounds

Biology; General

Plant products that are not important in metabolism but serve other purposes, such as attracting animals for pollination or killing parasites.

small intestine

Biology; General

A coiled tube in the abdominal cavity that is the major site of chemical digestion and absorption of nutrients; composed of the duodenum, jejunum, and ileum.