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Description
Flashcards by gfhgfhg gfhgfhg, updated more than 1 year ago
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Created by gfhgfhg gfhgfhg
about 8 years ago
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| Question | Answer |
| State Darwin's theory of natural selection | Darwin’s theory of evolution by natural selection states that all species of living things have evolved from simple life forms that first developed more than three billion years ago. |
| Why was the theory of evolution by natural selection only gradually accepted | ■ the theory challenged the idea that God made all the animals and plants that live on Earth ■ there was insufficient evidence at the time the theory was published to convince many scientists ■ the mechanism of inheritance and variation was not known until 50 years after the theory was published. |
| What was Lamarck's theory | Other theories, including that of Lamarck, are based mainly on the idea that changes that occur in an organism during its lifetime can be inherited. We now know that in the vast majority of cases this type of inheritance cannot occur. |
| Explain how natural selection works | ■ individual organisms within a particular species may show variation because of differences in their genes ■ individuals with characteristics most suited to the environment are more likely to survive to breed successfully ■ the genes that have enabled these individuals to survive are then passed on to the next generation. |
| what is meant by the term species | species are organisms which look very similar to each other and can interbreed to produce fertile offspring |
| suggest 3 factors that may affect the distribution of organisms in an area | 1. climate may change 2. new predator may move in 3. new competitor for food may arrive 4. new disease 5. loss of habitat |
| why do biologists draw evolutionary trees | they show the relationship between organisms and whether they had common ancestors |
| what are the main kingdoms of living things | animals , plants and microorganisms |
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