4) The presence of archaea has been inferred for rocks as old as: 1.8 billion ye

Question

4) The presence of archaea has been inferred for rocks as old as: 1.8 billion years 2.8 billion years 3.8 bllion years 4.5 billion years ) The geologic time when archaea first appeared was the .Paleozoic .Mesozoic . Cenozoic Hadean Archaean . Proterozoic 6) The earliest eukaryotic fossils are thought to occur in rocks how old? 600 million vears 1.8 billion years 2.5 billion years 3.5 billion years 7) In which geologic eon/era are the oldest eukaryotic fossils found? Hadean Archaean . Proterozoic .Paleozoic . Mesozoic . Cenozoic 8) The kingdoms of animals, fungi, plants and protists belong to which domain? Eukaryotes Bacteria Archaea *Prokaryotes

Explanation / Answer

4) 3.8 billion years.

Reason : Chemical traces of Archea or the methane-producing bacteria have been first found from the Isua district of Greenland, the oldest sediments on earth at about 3.8 billion years old.

5) Archean.

Explanation : The Archean period begins at 3.8 billion years and continues till 2.4 billion years.

6) 1.8 billion years.

Reason : Eukaryotes are defined by the presence of a well defined nucleus and the spherical fossils of likely algal protists called acritarchs were the first eukaryotes that probably appeared at about 1.8 billion years ago.

7) Proterozoic.

Reason : Eukaryotes evolved in the era when the earth's atmosphere contained little or no oxygen during the late Paleoproterozoic and early Mesoproterozoic (1800-1300 Ma).

8) Eukaryotes.

Reason : Eukaryotes are defined by the presence of a well defined nucleus and most kinds of algae, plants, fungi and animals fall under this domain.

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