April 10, 2019
Life is broadly defined as the condition of an organism that exhibits growth through metabolism, reproduction, and adaptation to its environment. These characteristics separate living organisms from inanimate objects.
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Today's Random Fact:
The cell is the basic unit of life, and an organism must be composed of at least one cell to qualify as a living thing.
The cells of every living organism contain deoxyribonucleic acid (DNA), a nucleic acid that holds the genetic instructions for the development and functioning of a life form. It is this substance that allows a living thing to grow and reproduce.
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Plant life began on the Earth's landforms about 430 millions years ago. The first plants were likely single-celled organisms distantly related to algae.
The first reptiles began life 300 million years ago, and modern mammals appeared roughly 75 millions years ago.
Apes originated on Earth about 35 million years ago, and the first apelike men appeared about 10 million years ago. The modern human species of Homo sapien has existed on the earth for only 100,000 years.