0
0
0

extinction

In biology and ecology, extinction is the termination of an organism or of a group of organisms (taxon), normally a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the fossil record) after a period of apparent absence. More than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earth's current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described. More recently, in May 2016, scientists reported that 1 trillion species are estimated to be on Earth currently with only one-thousandth of one percent described. Through evolution, species arise through the process of speciation—where new varieties of organisms arise and thrive when they are able to find and exploit an ecological niche—and species become extinct when they are no longer able to survive in changing conditions or against superior competition. The relationship between animals and their ecological niches has been firmly established. A typical species becomes extinct within 10 million years of its first appearance, although some species, called living fossils, survive with virtually no morphological change for hundreds of millions of years.
Varian homie 420 - a sad story about a guy who drinks coffee
Play now!
Varian homie 420

Added 2 months ago by Myself

6

Desert face - Pisakowa beauty
Play now!
Desert face

Added 4 months ago by Cieniu1969

53

A charming place - Somewhere where a magical dream begins :)
Play now!
A charming place

Added 4 months ago by Cieniu1969

243

dodo puzzle - dodo jigsaw puzzle dodo
Play now!
dodo puzzle

Added year ago by tre

59

redetoby - red e toby nemici amici
Play now!
redetoby

Added year ago by gess

47

Dark village - Halloween is a holiday celebrated in many countries on the last October evening. The leading element
Play now!
Dark village

Added year ago by Halloween

214 1

Ice Age - a story about the adventures of three heroes: Mammoth Manfred, colloquially known as Mańkiem, sloth
Play now!
Ice Age

Added year ago by sid

15

Dinozaury - Kilka różnych dinozaurów
Play now!
Dinozaury

Added over a year ago by Paulina

57

Cyganka i lew - Śpiąca Cyganka Celnika , dla Pauliny
Play now!
Cyganka i lew

Added over a year ago by Artur Bednarski

1

Prometejskie działanie - Cierpienie się nie kończy
Play now!
Prometejskie działanie

Added over a year ago by Wiolka

16

Syzyfowe cierpienie - Syzyf został ukarany
Play now!
Syzyfowe cierpienie

Added over a year ago by Wiolka

13

buldog piękniutki - buldog najwspanialsze zwierze swiata
Play now!
buldog piękniutki

Added over a year ago by buldog

96

tarzan władca małp - tarzan władca małp
Play now!
tarzan władca małp

Added over a year ago by Nikola

63

tyranozaur - Spróbuj ułożyć tyranozaura.
Play now!
tyranozaur

Added over a year ago by Małgośka

127

triceratops - Spróbuj ułożyć triceratopsa.
Play now!
triceratops

Added over a year ago by Małgośka

89

stegozaur - Spróbuj ułożyć stegozaura.
Play now!
stegozaur

Added over a year ago by Małgośka

76

dinozaury 36 - dinozaury 36 czesci. dinozaury 36 czesci
Play now!
dinozaury 36

Added over a year ago by Robert

111

Wilcza natura - O to wilk magiczny czyli wilcza natura
Play now!
Wilcza natura

Added over a year ago by Jakub

38

Magiczny smok - Spróbuj ułożyć puzzle przedstawiające magicznego smoka!
Play now!
Magiczny smok

Added over a year ago by Paulina

27

smaug hobbit g3 - gra szkolny konkurs wiedzy humanistycznej
Play now!
smaug hobbit g3

Added over a year ago by gim3ns

92

potwornickie - testowane puzle do celow zabawt
Play now!
potwornickie

Added over a year ago by Robert

18

dżungla i jej zwierzęta - dżungla i jej zwierzęta
Play now!
dżungla i jej zwierzęta

Added over a year ago by Nikola

115

kozice,kozice - kozice,kozice,kozice
Play now!
kozice,kozice

Added over a year ago by Nikola

77

dżungla i jej zwierzęta - jesień las zwierzęta leśne
Play now!
dżungla i jej zwierzęta

Added over a year ago by Nikola

62

dżungla i jej zwierzęta - jesień las zwierzęta leśne
Play now!
dżungla i jej zwierzęta

Added over a year ago by Nikola

61

Smok wśród lawy - Kolumn-7 Wierszy-9  styl simus (albo jakos tak xD ) Smok wśród wulkanów ;lawy
Play now!
Smok wśród lawy

Added over a year ago by Patrycja K

17

Opowieści z Narnii - Opowieści z Narnii: Książę Kaspian
Play now!
Opowieści z Narnii

Added over a year ago by LOVE!

44

Bitefight US - Bitefight US Contest / Third puzzle
Play now!
Bitefight US

Added over a year ago by Blair

39

Nowa gra dla dzieci - SPARK dużo kosztuje
Play now!
Nowa gra dla dzieci

Added over a year ago by Iwona

36