extinción en masa

extinción en masa

A time during which extinction rates are generally accelerated so that more than 50% of all species then living become extinct; results in a marked decrease in the diversity of organisms. Mass extinctions are thought to have occurred numerous times in Earth history, often from a variety of reasons: impacts, tectonism, changes in primary productivity of the seas, etc.

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extinción

Arkeoloji; İnsanın evrimi

The disappearance of a group in part or all of its range.

extinción

Arkeoloji; Evrim

The disappearance of a species or a population.

extinción

Doğal çevre; Su

La desaparición total de una especie debido a la falta de adaptación a los cambios ambientales.

núcleo del átomo

Biyoloji; Hücre biyolojisi

An atom's core; contains protons and one or more neutrons (except hydrogen, which has no neutrons).

número atómico

Biyoloji; Hücre biyolojisi

The number of protons in the nucleus of an atom.

asma

Biyoloji; Hücre biyolojisi

A respiratory disorder caused by allergies that constrict the bronchioles by inducing spasms in the muscles surrounding the lungs, by causing the bronchioles to swell, or by ...

ascomicetos

Biyoloji; Hücre biyolojisi

Division of fungi that contains the yeasts and morels; ascomycetes produce an ascus (or sac) in which ascospores are produced.

selección artificial

Biyoloji; Hücre biyolojisi

The process in which breeders choose the variants to be used to produce succeeding generations.

reproducción asexual

Biyoloji; Hücre biyolojisi

A method of reproduction in which genetically identical offspring are produced from a single parent; occurs by many mechanisms, including fission, budding, and fragmentation.