Page 121 - 100 Events That Made History

Evolving animals
As he traveled, Darwin realized that similar
animals showed slight variations in
appearance on different islands.
Darwin decided that, over many
By the way…
generations, ANIMALS EVOLVE
People laughed when I
(change) to suit their surroundings.
said that humans evolved
Those that adapt to their surroundings
from apes. We now know
survive, but those that do not adapt die Darwin’s book
that we share 98 percent
out. This idea came to be known caused an uproar
of our DNA with chimps.
as the “survival of the fittest.” first published.
when it was

Controversial claims
Darwin eventually made his ideas public in 1859
in his book On the Origin of Species. Some
religious leaders were ANGRY, because they
believed Darwin’s ideas about evolution went
against their belief that God had created all
living things. However, within a decade, his
ideas came to be widely accepted.

How it changed the world

Darwin’s ideas paved
the way for vital

breakthroughs in biology,

In 1953, British scientists
In 1910, American genetics, and medicine.
Thomas Hunt Morgan discovered the STRUCTURE
used FRUIT FLIES to show OF DNA—the substance
that structures called that contains the essential
chromosomes, found in code needed for the
cells, contained all the cells in a living organism
flies’ genetic information. to work properly.

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