How does evolution lead to diversity?
Evolution and diversity result from the interactions between organisms and their environments and the consequences of these interactions over long periods of time. Organisms continually adapt to their environments, and the diversity of environments that exists promotes a diversity of organisms adapted to them.
What causes diversity of life?
Life on earth is incredibly diverse. Biological diversity is the variety of life on earth. Biological diversity is constantly changing. It is increased by new genetic variation and reduced by extinction and habitat degradation.
Why is diversity important in evolution?
Genetic diversity is important because it helps maintain the health of a population, by including alleles that may be valuable in resisting diseases, pests and other stresses. If the environment changes, a population that has a higher variability of alleles will be better able to evolve to adapt to the new environment.
How is evolution important to life?
Evolution explains how living things are changing today and how modern living things have descended from ancient life forms that no longer exist on Earth. As living things evolve, they generally become better suited for their environment. This is because they evolve adaptations.
Does evolution mean improvement?
Evolution does not mean improvement, or progress, or anything like that, it just means change. If a species evolves, it changes, it doesn’t “improve” or become more “highly-evolved”, just different.
What are the characteristics of evolution?
Random variation, heredity and natural selection are key mechanisms of evolution. Individuals with features or traits that function well in their local environment will be more likely to survive, passing on their genes to their offspring.
What is an example of parallel evolution?
‘Parallel evolution’ occurs when independent species acquire similar characteristics while evolving together at the same time in the same ecospace. An example of parallel evolution is extinct browsing-horses and paleotheres.
Which is very good example of parallel evolution?
Parallel evolution, the evolution of geographically separated groups in such a way that they show morphological resemblances. A notable example is the similarity shown by the marsupial mammals of Australia to the placental mammals elsewhere.
What is an example of convergent evolution?
Convergent evolution is when different organisms independently evolve similar traits. For example, sharks and dolphins look relatively similar despite being entirely unrelated.
Is warm blooded convergent evolution?
It arises independently by convergent evolution in more than one clade. For example, both mammals and birds are able to maintain a high constant body temperature (warm-blooded). However, the ancestors of each group did not share this character, so it must have evolved independently.
What is an example of homology?
A common example of homologous structures is the forelimbs of vertebrates, where the wings of bats and birds, the arms of primates, the front flippers of whales and the forelegs of four-legged vertebrates like dogs and crocodiles are all derived from the same ancestral tetrapod structure.
How is homology used as evidence of evolution?
Homologous structures provide evidence for common ancestry, while analogous structures show that similar selective pressures can produce similar adaptations (beneficial features). Similarities and differences among biological molecules (e.g., in the DNA sequence of genes) can be used to determine species’ relatedness.