Darwin observed similar but non-identical species of finches on each island. He noticed that their beaks seemed to be adapted to their food source. After some time thinking and reading the work of other scientists, Darwin proposed his theory of natural selection. This states that all living things
evolved from a common ancestor.
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Question 2
2.
Word Bank: adaptedoffspringresources more
Here's how Darwin's theory of Evolution works:
1. Not all individuals survive and reproduce, due to predators or competition for _______ .
2. Only individuals that are well _______ to their environment will survive & reproduce.
3. These individuals will pass on their beneficial traits to their _______ .
4. Over many generations, the species has evolved so that the beneficial trait is _______ common and the less beneficial is less common or even eliminated.
Question 3
3.
Complete the example of Natural Selection by filling in the words in the word bank.
Word Bank: evolvedblackhabitatmutationcamouflagedvariationpredatorssurvive reproducetrait
Question 4
4.
Natural selection changes the range of traits in a population - there are 3 ways it can change. Let’s look at a moth population that shows variation in its color, from light to dark brown. Show what would happen if this population moved into each scenario shown below.
Word Bank: darkagainsthabitatlightcamouflagedlichenpredatorsextremes decrease
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Question 6 | 00:17
Questions 7 & 8 | 00:32
Questions 9 & 10 | 01:16
Questions 11 & 12 | 01:54
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Question 6
00:17
Questions 7 & 8
00:32
Questions 9 & 10
01:16
Questions 11 & 12
01:54
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Question 14 | 02:17
Question 15 | 02:30
Question 16 | 02:38
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Question 14
02:17
Question 15
02:30
Question 16
02:38
Question 17
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When populations of animals are ______________ for long periods of time, the individuals of that population might look completely ______________. If this continues to happen for many years, the animals might not be able to __________.
This is how new species can be made. For example, Darwins finches were separated for so long that they developed different features than neighboring ____________, especially beak sizes. Now each finch is a ________________.
