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The Great Wall of China is an example of a wall used to protect a place.
The Berlin Wall is an example of a wall to keep two places separate, east and west Germany.
Theme of it will be family roots
This states that a mutual relationship between two peoples is bettered when there is a satisfactory balance of rewards perceived by each person individually. The more equal the balances are held, the stronger and more permanent the relationship becomes.
Answer:
Explanation:
More than 99 percent of all organisms that have ever lived on Earth are extinct. As new species evolve to fit ever changing ecological niches, older species fade away. But the rate of extinction is far from constant. At least a handful of times in the last 500 million years, 75 to more than 90 percent of all species on Earth have disappeared in a geological blink of an eye in catastrophes we call mass extinctions.
Though mass extinctions are deadly events, they open up the planet for new forms of life to emerge. The most studied mass extinction, which marked the boundary between the Cretaceous and Paleogene periods about 66 million years ago, killed off the nonavian dinosaurs and made room for mammals and birds to rapidly diversify and evolve.
