Examlex
The energy for the synthesis of organic molecules on primordial Earth came from lightning and intense UV radiation.
Isotopes of Oxygen
Variants of oxygen atoms with the same number of protons but different numbers of neutrons, leading to different atomic masses.
Ancient Earth
Refers to the geological and biological conditions of Earth in its early history, millions to billions of years ago.
Ancient Water
Refers to water that has been trapped in geological formations for thousands or even millions of years, often undisturbed by modern pollution.
Arctic and Antarctic Ice
Frozen water in the polar regions of the Earth, including sea ice, ice sheets, and glaciers, playing crucial roles in global climate regulation.
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Q114: birds<br>A)Petromyzontidae<br>B)Amphibia<br>C)Crinoidea<br>D)Metatheria<br>E)Chondrichthyes<br>F)Actinopterygii<br>G)Urochordata<br>H)Aves<br>I)Myxinoidea<br>J)Holothuroidea<br>K)Cephalochordata<br>L)Eutheria<br>M)Ophiuroidea<br>N)Testudinata<br>O)Squamata<br>P)Asteroidea<br>Q)Prototheria<br>R)Echinoidea<br>S)Hemichordata