triggering period

См. также в других словарях:

• Ordovician Period — Interval of geologic time, 490–443 million years ago, the second oldest period of the Paleozoic Era. It follows the Cambrian and precedes the Silurian. During the Ordovician, many of the landmasses were aligned in the tropics. Life was dominated… …   Universalium

• embryonic period — the time from union of gametes (or in gynogenetic fishes the triggering of cell division) until exogenous nutrition. This period is characterised by endogenous nutrition from the yolk of the ovum (or in viviparous fishes from an ovarian secretion …   Dictionary of ichthyology

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