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61. On the right there are two schemes including fossil agnathan groups congruent with the classifications to the left.

62. Another large reservoir of fossil fuels, solid gas hydrates, has recently come to public recognition.

63. And they produce oxygen which animals need to breathe, and which helps to replace that lost by burning fossil fuels.

64. Recent fossil finds in Africa have excited interest among palaeontologists.

65. This has led to controversy, particularly as regards the date of fossil human remains from California.

66. Louis Agassiz, then the world authority on fossil fish, studied Miller's specimens and helped to describe some of them.

67. Hasn't he any conception of the devastation caused to this planet by burning fossil fuels?

68. The sediments filling caves or fissures in limestone are frequently repositories for fossil teeth.

69. The estimated global emissions of carbon from fossil fuels alone have tripled since 1950.

70. A few other fossil species of Rhus are known from the Tertiary rocks.

71. In consequence,[http://sentencedict.com/fossil.html] amphibian fossils become very scarce indeed in later geological periods and there are long gaps in their fossil history.

72. A complete media is found in many Palaeozoic fossil insects and in the Ephemeroptera among recent forms.

73. Fossil flowers are extremely rare because of their delicacy and because they are shortlived.

74. This phenomenon may also explain some of our anomalous fossil distributions and extinctions.

75. Sampling for mammal fossils often involves the patient sieving of great quantities of sediment to extract the fossil teeth.

76. My purpose here is to review how the fossil record of early metazoans might be integrated with the new phylogeny.

77. These will all reduce emissions from fossil fuels and so help combat global warming and acid deposition.

78. The fossil record is silent on this transition, but the earlier stages of mollusc evolution are becoming clear.

79. Geothermal energy does not involve the burning of fossil fuels and therefore makes a negligible contribution to global warming.

80. There are species living today related to this fossil species.

81. But the fossil record of the insects is far from perfect - very sporadic and selective.

82. Ants frequently got caught in the pine resins that were destined to become amber, and numerous fossil species have been recognized.

83. No details of the stamens are present in the fossil state.

84. The dinosaurs alone have commanded as much popular attention as the rest of the fossil animal kingdom combined.

85. This interesting stance has been seen in more recent dinosaur fossil discoveries.

86. A further twist to the uncertainty of fossil fuel supplies was provided by the growing militancy of Britain's miners.

87. But all fossil fuels, especially the cleanest anthracite, burn to produce abundant carbon dioxide.

88. The so-called energy crisis is really a fossil fuel crisis.

89. Several specialists questioned whether there is enough fossil evidence yet to support a claim for a new genus.

90. Alternative Energy Sources One of the major problems of fossil fuels and particularly coal is pollution.