Examlex
Which characteristic of Venus has led many to call it the "sister planet" to Earth?
Mitochondria
Membrane-bound cell organelles that produce most of the chemical energy needed to power the cell's biochemical reactions.
Earth's Early History
A period spanning from the formation of Earth about 4.5 billion years ago to the first appearance of abundant, complex life approximately 541 million years ago.
Bombardments
Intense and frequent attacks or hits, often used in the context of celestial bodies impacting a planet.
Plate Tectonics
A scientific theory explaining the motion of the Earth's lithosphere, which is divided into tectonic plates that move over the mantle, leading to many Earth's surface features.
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