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61. A fifth of all freshwater fish are either extinct or endangered.

62. They really are extinct, but managed to compete successfully with the bivalves for a considerable time.

63. By the turn of this century the barrens were almost extinct, and the list of their constituent species hardly recorded.

64. Once extinct this wonderful animal will be gone for ever.

65. Much of the software currently in use is based upon virtually extinct programming languages that hardly anyone understands any more.

66. Should governments be free to ban imports of things they fear will become extinct?

67. He played an almost extinct worm crawling through dead leaves.

68. Sure, but like any evolutionary challenge, it will separate the survivors from the extinct.

69. This is because where selfishness brings higher rewards than altruism, selfish individuals leave more descendants, so altruists inevitably become extinct.

70. At school they had once heard of some animal which had become extinct because of its huge flat feet.

71. Nearly half of these species appear nowhere else on the planet and would become extinct unless the Andes hot spot was saved.

72. Archaeological analyses say as much about the interpreters as about the extinct cultures.

73. We have no way of knowing whether any other animals now extinct - pterodactyls perhaps? - also evolved the technology independently.

74. It is estimated that over 30 species have become extinct while waiting for a listing.

75. Can we comfort ourselves with a freezer full of cells as species disappear and the wild itself becomes extinct?

76. I sat on a log among the shadows of creatures now extinct and others long since departed for pasture in the south.

77. It helps publishers' bottom lines, too(sentencedict.com), that head-to-head competition among papers is virtually extinct.http://sentencedict.com

78. The first is to have the carbonaceous meteorites derive directly from low-speed near-Earth asteroids that are extinct comet cores.

79. Marriage and the family as we have known them are becoming extinct.

80. For these reasons, if for no others, quangos seem unlikely to become extinct.

81. Nigel Chaffrey, London How do scientists verify that former volcanoes really are extinct? How often have they been wrong?

82. A wide range of other volatile materials is also present in all extinct comet cores and C asteroids.

83. But there was no laughter, and he had to remember that Browning Societies had been extinct for a long time.

84. The blue-rinsed dame and the bottle-nosed blimp are extinct species here.

85. She says: It would be a tragedy if the dormouse became extinct.

86. Eventually the rarer genes will disappear and the genetic types leaving fewer offspring will become extinct.

87. By 1830 the breed was almost extinct and by 1907 the situation was critical.

88. Undiscovered until 1918, it was thought extinct after the 1937 hurricane submerged its coastal savannas, but it has subsequently reappeared.

89. If the moth were to become extinct, the yuccas would never set seed.

90. The line is now extinct but at the time we arrived they had lived in the castle for some five hundred years.