front 1 Evolution works by | back 1 tinkering with existing structures |
front 2 Hox genes are thought to play an important role in the development of different morphologies because they | back 2 provide positional information in the embryo. |
front 3 The atmosphere of early Earth probably contained no O2 until the emergence of organisms that used | back 3 water as an electron source for photosynthesis |
front 4 Radiometric dating allows us to | back 4 indirectly date fossils up to billions of years old based or minerals in surrounding volcanic strata. |
front 5 The oldest fossils usually are found in | back 5 the deepest strata |
front 6 Earth probably formed __________ and the first life evolved as early as _________ | back 6 4.5 billion, 3.9 billion |
front 7 RNA is believed to be the genetic material because RNA has both | back 7 informational storage and catalytic properties |
front 8 Miller and Ureys experiments that attempted to recreate conditions on early Earth were significant because they showed that | back 8 Organic molecules such as amino acids could be produced from inorganic molecules |