So far, we've looked at natural selection as an agent of change. When we look around the world, however, we see many animals that have remained relatively unchanged for tens of thousands of years — in some cases, even millions of years.Sharksare one example. It turns out that natural ...
Directional selection is a type of natural selection in which one of the extreme variations in a trait is selected. For example, in a population of giraffes, each individual giraffe has a slightly different neck length. This variation in the trait gives each giraffe a different advantage when ...
Peppered moths offer an example of rapid natural selection during the industrialization of the United Kingdom. Commor pale-coloured peppered moths became conspicuous on tree trunks that had darkened with soot, making them easy prey for birds, while darker ones preferentially survived long enough to ...
True False 5. Humans with sickle cell anemia appear to be immune to the effects of malaria indicating that the sickle cell trait is an example of a natural selection at work. True False Send Your Results (Optional) Your Name To Email...
Theory shows how sexual selection can exaggerate male traits beyond naturally selected optima and also how natural selection can ultimately halt trait elaboration. Empirical evidence supports this theory, but to our knowledge, there have been no experime
根据第一段中“Natural selection is the process(过程)by which one type of animal survives because of certain characters that make it more likely to live than others. The history of the peppered moth(灰蛾)is an example of the natural selection process.(自然选择是一个过程,一种动物之所以能够...
Natural selection is a dynamic and ongoing process. While the ability to adapt to recent changes in the industry may be a good indicator of a company's or trader's overall aptitude, it does not guarantee that they will be able to adapt to all future changes in the business environment. ...
Natural selection is the process by which individuals with favorable traits are more likely to survive and reproduce, passing on those traits to future generations. An example of natural selection is the peppered moth, where the darker moths were more likely to survive and reproduce during the ind...
Both sexual selection and natural selection can influence the form of dimorphism in secondary sexual traits. Here, we used a comparative approach to examine the relative roles of sexual selection and natural selection in the evolution of sexually dimorphic coloration (dichromatism) and ornamentation in...
1Natural selection is the process by which one type of animal within a species thrives because of certain characteristics that make it more likely to live than others in its group. The history of the peppered moth(灰蛾)is an example of the natural selection process. In 19th century England,...