PBS - Isn't evolution just a theory? PBS - Who was Charles Darwin?

Human Anatomy & Physiology (11th Edition)
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PBS - Isn't evolution just a theory?
PBS - Who was Charles Darwin?
Transcribed Image Text:PBS - Isn't evolution just a theory? PBS - Who was Charles Darwin?
Darwin and the Theory of Evolution - V2
So how and why did Charles Darwin come to develop his ground-breaking Theory of Evolution?
In Darwin's lifetime the Christian biblical idea that about 6,000 years ago god created all the species
exactly as we see them, was the accepted belief. When he was only 22, Darwin was the naturalist on the
HMS Beagle. He voyaged around the world for 5 years, with numerous long stops to
and observe. These observations lead him to conclude that Biblical stories could
Darwin made many
that caused him to ask key
Some that he later used to support the Theory of Evolution included:
Darwin's 5 Observations
Key Questions
1. Rodents in South America
and were very
from
Why are similar organisms clustered in
the same regions?
European rodents.
2. The
Why are similar living and fossilized
glyptodont looked like a
armadillo.
organisms found in the same region?
3. The tortoises, finches and plants on the
looked like the nearest
Why did island organisms look like those
from the nearest mainland?
4. Each finch specialized in a
and had a
size and shape.
Why was there a lot of biodiversity on
such small islands?
5. Genetic
are passed from parents to
Did nature have a selection process?
offspring and there was a lot of
in the offspring.
Many scientists in Darwin's time knew that simple organisms developed gradually and changed to more
complex organisms, but they did,
these changes
occurred. They were also arguing about the age of the Earth, but they knew it was much more than
6,000 years old.
The key idea for Darwin was in
proposal that populations produced
than the environmental resources could support. There was
for food, water and space that lead to weakness, starvation or death by disease.
Darwin used the term
to describe the process that only the offspring
for the environment would survive. We now define natural selection as the
levels of
and reproduction of individuals due to differences
in
Natural selection, in a nutshell:
Yum! Green beetles! Our favorite
按短按
****
Green beats have been selected against and brown
underwent
In Darwin's famous book, On the Origin of Species, he described how
due to natural selection. Darwin did_________use the word
because he thought it indicated progress or improvement of a species towards a goal.
Theory of Evolution Summarized: Individuals in a population that had the best traits to
other organisms in the local environment were fittest.
there
would be a
in the population as only the best
or fittest,
individuals survived and reproduced.
Transcribed Image Text:Darwin and the Theory of Evolution - V2 So how and why did Charles Darwin come to develop his ground-breaking Theory of Evolution? In Darwin's lifetime the Christian biblical idea that about 6,000 years ago god created all the species exactly as we see them, was the accepted belief. When he was only 22, Darwin was the naturalist on the HMS Beagle. He voyaged around the world for 5 years, with numerous long stops to and observe. These observations lead him to conclude that Biblical stories could Darwin made many that caused him to ask key Some that he later used to support the Theory of Evolution included: Darwin's 5 Observations Key Questions 1. Rodents in South America and were very from Why are similar organisms clustered in the same regions? European rodents. 2. The Why are similar living and fossilized glyptodont looked like a armadillo. organisms found in the same region? 3. The tortoises, finches and plants on the looked like the nearest Why did island organisms look like those from the nearest mainland? 4. Each finch specialized in a and had a size and shape. Why was there a lot of biodiversity on such small islands? 5. Genetic are passed from parents to Did nature have a selection process? offspring and there was a lot of in the offspring. Many scientists in Darwin's time knew that simple organisms developed gradually and changed to more complex organisms, but they did, these changes occurred. They were also arguing about the age of the Earth, but they knew it was much more than 6,000 years old. The key idea for Darwin was in proposal that populations produced than the environmental resources could support. There was for food, water and space that lead to weakness, starvation or death by disease. Darwin used the term to describe the process that only the offspring for the environment would survive. We now define natural selection as the levels of and reproduction of individuals due to differences in Natural selection, in a nutshell: Yum! Green beetles! Our favorite 按短按 **** Green beats have been selected against and brown underwent In Darwin's famous book, On the Origin of Species, he described how due to natural selection. Darwin did_________use the word because he thought it indicated progress or improvement of a species towards a goal. Theory of Evolution Summarized: Individuals in a population that had the best traits to other organisms in the local environment were fittest. there would be a in the population as only the best or fittest, individuals survived and reproduced.
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