LM 27 - 6 The effect on survival and reproduction of birds...

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Science Sarah Kim LM 27 p. 5 4/6/09 1. The seeds that were no longer produced caused there to be more competition for the other available seeds. The seeds that were larger made it difficult for some of the birds to obtain these new seeds. However, for other birds they were a great blessing because they had a new food source that they were well adapted to obtain. 2. Food, water, mates, light, and shelter are all resources that can be limited in an environment. 3. As a whole, the birds were affected adversely. However, I think the chopsticks suffered the most. For one food source, their average yield for each prey and predator was halved from 22 to 11 4. Scissors and clothespins seemed to do a little better in the new, wet environment. 5. Tweezers are the most likely to have offspring because they had a lot of food in every prey category. Since they had more food, they would be stronger and when they reproduced, their offspring would be stronger and more likely to reach adulthood.
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Unformatted text preview: 6. The effect on survival and reproduction of birds is an example of natural selection. Artificial selection is where humans purposely select two animals that have traits humans like and breed animals so that their offspring will have those traits. 7. Natural selection operates on individuals within a population. Individuals that have the traits most suitable for their environment survive, while those who don’t have those qualities die. The individuals that live mate and produce offspring that have the traits to help them survive. Over time, the entire population acquires this trait through the process of evolution. 8. No, an individual cannot evolve. Evolution occurs over spans of generations, which is a long time. The key to evolution is intraspecific variation—or the similar but different DNA of the individuals in a population....
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