Multiple Choice
Were there any eukaryotic cells on Earth 1.5 billion years ago?
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24. History of Life on Earth
Origin of Life
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Which of the following is considered the earliest form of life to have appeared on Earth?
A
Prokaryotic cells (such as bacteria)
B
Eukaryotic cells
C
Multicellular plants
D
Fungi
Verified step by step guidance1
Understand the timeline of life on Earth: The earliest forms of life appeared approximately 3.5 to 4 billion years ago, during the Precambrian era. These organisms were simple and adapted to the harsh conditions of early Earth.
Recognize the characteristics of prokaryotic cells: Prokaryotic cells are simple, single-celled organisms without a nucleus or membrane-bound organelles. Examples include bacteria and archaea. These cells are considered the earliest form of life due to their simplicity and ability to survive in extreme environments.
Compare prokaryotic cells to eukaryotic cells: Eukaryotic cells are more complex, containing a nucleus and membrane-bound organelles. They appeared much later in Earth's history, around 1.5 billion years ago, and are not considered the earliest form of life.
Evaluate the other options: Multicellular plants and fungi are even more complex than eukaryotic cells and appeared much later in evolutionary history. They require eukaryotic cells as a foundation for their development.
Conclude that prokaryotic cells, such as bacteria, are the earliest form of life to have appeared on Earth, based on their simplicity, adaptability, and evidence from fossil records.
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